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*
Carolina Population Center and
*
Department of Nutrition, University of North Carolina, Chapel Hill, NC
3To whom correspondence should be addressed. E-mail: Plg3{at}unc.edu.
| ABSTRACT |
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KEY WORDS: India womens nutritional status nutrition transition obesity and underweight.
| INTRODUCTION |
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By nearly any measure, India remains one of the poorest countries in
the world, with a population of over one billion and a fertility rate
well above replacement level (6)
. Nevertheless, infant
mortality rates dropped from 115 in 1980 to 70 in 1998, and the total
fertility rate dropped from 5 to 3.2 during the same period
(6)
. Improvements in the nutritional status of the
population have been less impressive. More than half of the worlds
undernourished population live in India (7)
and more than
half of Indian children are undernourished (8)
. Health
status of women in India reflects gender discrimination from birth
(9
11)
, inequitable distribution of health resources
(12)
, and early and frequent reproductive cycling and
infection (13
,14)
. More than half of Indian women are
anemic; 15 and 2% have moderate and severe anemia, respectively
(4)
.
Although the growing prevalence of overweight and obesity has received
attention in many developing countries, there is a dearth of data for
India, partly because of the persisting high prevalence of
undernutrition (3
,15)
. Small-scale studies conducted
in the 1990s, based mainly on urban samples, suggest that the
proportion of the overweight population in Indian towns and cities is
large and increasing, ranging from 33 to 51% (16)
. A
study in North India of 3575 men and women found the urban prevalence
of overweight to be more than double that of the rural population, with
27% having a body mass index (BMI) > 25
kg/m2 compared with 11% in the rural population
(17)
. Data collected by the National Nutrition Monitoring
Bureau in 1990 reported that 4.1% of Indian women had a BMI > 25
kg/m2, with no increase in this proportion
between 1970 and 1990 (18)
. Popkin and Doak
(19)
reported the results of a 19881990 study in India
based upon 21,361 individuals in which 3.5% of the population were
found to have a BMI > 25 kg/m2 and 0.5% a
BMI > 30 kg/m2. The recent NFHS 2 data for
India show that more than one third of women aged 1549 y have a BMI
< 18.5 kg/m2, whereas nearly a quarter of
urban women, who account for 27% of the sample population, are
overweight or obese (20)
. In the state of Andhra Pradesh,
in which 26% of the sample population are urban, 25% of women are
overweight or obese. This compares with the large cities, which account
for 4% of the population, in which 37% of women have a BMI
25. In contrast, 42% of rural women have a BMI < 18.5
kg/m2 (4)
. As rates of overweight
and obesity rise, India is beginning to experience the burden of
associated chronic diseases, particularly cardiovascular disease and
adult onset diabetes (21
,22)
. The WHO estimates that
diabetes in India will increase from 19.4 million in 1995 to 57.2
million in 2025 (21)
.
There are few data available that shed light on changes in lifestyle in
urban areas of India. The World Development report (23)
showed an increase in the consumption of fat, saturated fat, sugar,
salt, and vegetable ghee (clarified butter) in India. National surveys
by the National Nutrition Monitoring Bureau show that 5% of the
population consumes 40% of the available fat (24)
. Shetty
(25)
reported that high income groups in India consume a
diet with >32% of the energy from fat. Data from NFHS 2 reported
large differences in dietary diversity between urban and rural women,
with urban women reporting regular consumption of milk, fruits and
curd, and nearly double the frequency of eating eggs and meat compared
with rural women (4)
.
Using NFHS 2 data, this paper examines demographic, socioeconomic, cultural and health determinants of overweight and thinness among women living in the southern Indian state of Andhra Pradesh. We hypothesize that socioeconomic status, not urban/rural residence, is an independent and strong predictor of womens BMI.
| SUBJECTS AND METHODS |
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We analyzed data from the second Indian National Family Health Survey
1998/1999 (NFHS 2) for the state of Andhra Pradesh (4)
.
NFHS 2 is a demographic and health survey collected as part of the
Demographic and Health Survey (DHS) program, which is funded primarily
by the United States Agency for International Development. Additional
funding for the nutritional components of the survey in India was
provided by the United Nations International Childrens Emergency Fund
(UNICEF).5
The national survey covered a representative stratified
random sample collected between November 1998 and December 1999 of
95,000 women aged 1549 y from the 26 states of India. The main
strata used in the sampling process were rural and urban areas. The
primary sampling units (villages in rural areas and census enumeration
blocks in urban areas) were selected with probability proportional to
size from the rural and urban areas. Households were selected from
within the selected primary sampling units. Andhra Pradesh, a state in
southern India that was the first state to publicly release NFHS 2
data, provided the sample for the present analysis. It includes survey
and nutrition status data on 4032 ever married women aged 1549 y from
3872 households.6
Measures.
In the first National Family Health Survey 1992/1993 (NFHS 1), height and weight measurements were taken among children <4 y old in sample households, but not of women respondents. NFHS 2 included weights and heights of women of reproductive ages and children < 3 y old, as well as hemoglobin measures.7 Women were weighed using a solar scale with accuracy ± 100 g. Height was measured using an adjustable wooden measuring board designed to give accuracy of measurement of within 0.1 cm in a field situation. A BMI was calculated for all nonpregnant women who had not given birth within 2 mo of the survey, to avoid producing BMI values that were inflated by the womans current pregnancy status.
Data analysis.
Logistic regression was used to identify socioeconomic, regional,
health, diet and demographic determinants of over- and underweight.
Primary outcome variables in the analyses were created from BMI
measurements collected in the survey. We categorized the BMI variable
into six groups that classify womens nutrition status, using the WHO
(26)
recommendations for preliminary analysis. The six
groups identify women who are obese, BMI
30 kg/m2;
overweight, BMI 25.029.9 kg/m2; normal weight, BMI
18.524.9 kg/m2; mildly thin, BMI 17.0018.49
kg/m2; moderately thin, BMI 16.0016.99 kg/m2;
or severely thin BMI < 16.00 kg/m2
(26)
8
. For the 15- to 17-y-old adolescent females in the sample,
we used Coles definitions of adolescent obesity, overweight and
normal weight9
(27)
. The same definition for thinness was used
for all women in the sample regardless of age because no
age-specific definitions of thinness for adolescents have been
suggested (27)
.
Dichotomous variables were created in 1995 [based on the WHO
(27)
groups] to create the outcome variables used in the
logistic regression models. Two logistic regression models were
utilized to compare the factors associated with being underweight (BMI
< 18.5 kg/m2) vs. normal (BMI 18.524.9
kg/m2) in the first model, and overweight or obese (BMI
> 24.9 kg/m2) vs. normal in the second model.
Variables tested for significance in their association with BMI in each
of the logistic regression models are presented in Table 1
. The variables fall into five main categories, i.e., demographic,
socioeconomic, health, diet and cultural factors. Model 1 included only
the urban location variable. Model 2 introduced the demographic
variables in addition to the location variable. Four additional models
were tested, adding to the variables already included in the earlier
models. Model 3 introduced the cultural variables, model 4 the health
variables, model 5 the diet variables, and finally in model 6, we
included the socioeconomic variables. Models 16 were repeated twice,
once for the model of overweight vs. normal, and a second time for the
model of underweight vs. normal. Building the models in this way
allowed the significance of the association between location and BMI to
be tested, controlling for a range of other factors. In addition, this
allowed the detection of factors that reduced the significance of the
location variable in each model, hence allowing the identification of
variables associated with the urban living environment and a womans
weight status.
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We used SPSS (Chicago, IL) version 10 for the preliminary statistical
analyses. All women with height and weight data in the survey were
included in the preliminary analysis (98% of the original sample).
Descriptive statistics were produced for Andhra Pradesh using the
individual sampling weights. In Andhra Pradesh, the sampling weight
corrects for differential nonresponse between the geographical regions
in which the survey was administered. Using the sample weight in the
analysis allows correction of disproportionate representation of women
from certain regions because of nonresponse. Failure to account for
weights in the analysis can produce misleading point estimates
(28)
. Pearsons
2 was used to determine
significant differences observed within the various categories of the
WHO (26)
BMI grouping variable in relation to the three
indicators of socioeconomic status, i.e., standard of living index,
location of residence and maternal education. Differences were
considered significant at P < 0.05.
Stata Release 6 (28)
was used to fit logistic regression
models using maximum likelihood estimation. To account for the complex
survey design, we included the state level individual sampling weight,
strata (urban/rural) and clustering variable (primary sampling unit),
using the survey option to estimate the models in Stata. Accounting for
weighting in the analysis allows a design-based point estimate to
be obtained. In addition, taking account of the stratification and
clustering of the data provides more robust estimates of the associated
standard errors than an analysis that ignores the survey design
characteristics (28)
.
Six logistic regression models were used to model the overweight vs.
normal weight outcome for all women who were classified as overweight
(BMI
25 kg/m2) or normal weight (BMI 18.5024.99
kg/m2) in the sample (n = 2509). A
further six models for estimating underweight vs. normal weight were
completed, with women classified as underweight (BMI < 18.50
kg/m2) or normal weight (BMI 18.5024.99
kg/m2) in the sample (n = 3466). The
six models were built by adding a new group of variables in each model,
based upon those presented in Table 1
:
Model 1: Location of residence
Model 2: Model 1 + demographic variables
Model 3: Model 2 + cultural variables
Model 4: Model 3 + health variables
Model 5: Model 4 + diet variables
Model 6: Model 5 + socioeconomic variables
We retained only significant variables, with a two-tailed
P-value < 0.05 in any one of Models 16 for a
particular outcome (Tables 3
and 4)
.10
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| RESULTS |
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25
kg/m2; of these, 2.2% were obese (BMI > 30
kg/m2). Although the percentage of overweight
women was much smaller than those classified as underweight, there were
specific subgroups of the population in which a much higher proportion
of women fell within the overweight category.
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25 kg/m2
compared with 8% in the rural population. Similarly, the proportion of
the rural population with a BMI < 18.5
kg/m2 was 42%, compared with only 12% in the
large cities. As expected, the group with a high standard of living had
a higher proportion of the population (33%) with a BMI
25
kg/m2 compared with the group with a low standard
of living (4%). The proportion of women with a BMI < 18.5
kg/m2 was 14% in the high group and 49% in the
lowest socioeconomic group. Finally, women who completed primary
education were more likely to be classified as overweight or obese
compared with women who did not, although the difference was not as
great as for the region of residence and standard of living variables.
The
2 statistic was highly significant for the
association between each of these socioeconomic variables and the BMI
groups before controlling for any other variables.
The results of the logistic regression analysis in which the outcome
compares overweight and obese women (BMI
25
kg/m2) with those of normal weight are presented
in Table 3
. Results are presented as odds ratios with 95% confidence intervals.
Older women displayed a higher probability of being overweight or obese
compared with younger women, with the probability increasing for each
5-y age group.
Religion was a significant cultural factor because Muslim women were more likely to be overweight or obese than women from other religious groups (primarily Hindu). For the nutrition variables, women who daily consumed nongreen leafy vegetables were more likely to be overweight or obese than those who ate them weekly, occasionally or rarely. In addition, women who reported eating fruits daily or weekly were more likely to be overweight or obese than those who ate them occasionally or rarely. Finally, mothers who reported breast-feeding at the time of the survey had a lower probability of being overweight or obese than those who did not.
In addition, there were a number of socioeconomic and environmental variables associated with overweight or obesity. Respondents living in households with higher socioeconomic status were more likely to be either overweight or obese than those living in poorer households. The respondents occupation, the highest level of education of any household member and the standard of living index were all significantly associated with being overweight and obese. Women who lived in households with a high standard of living index had a significantly higher probability of being overweight or obese. Women who did not work were significantly more likely to be overweight or obese than their counterparts who were working outside of the home. However, women working in professional, technical, managerial, office, clerical or sales positions were not significantly different in their probability of becoming overweight or obese compared with housewives. Women living in households in which at least one member had > 12 y of education were more likely to be overweight or obese. This was a more significant predictor of overweight and obesity than the womans own level of education.
Despite the strong association between urban residence and overweight and obesity in model 1, the location variable was no longer significant in model 6, after controlling for the other factors entered into the analysis. The introduction of the religion variable in model 3 removed the significant difference between large cities and other urban areas in the proportion of women who were overweight or obese, as was shown in models 1 and 2. A significant difference between large cities and rural areas was retained until model 5, when the introduction of the socioeconomic variables in model 6 removed the significance of the location variable.
The results of the logistic regression model comparing
underweight women (BMI < 18.5 kg/m2) with
those of normal BMI are presented in Table 4
. The findings were similar to those shown for the models of obesity and
overweight. Younger age was the most important demographic predictor of
underweight. Consistent with the findings in the models for obesity and
overweight, the dietary variables significantly associated with being
underweight were the reported frequency of consumption of fruits, and
nongreen leafy vegetables.
Socioeconomic and living environment variables associated with being underweight were also consistent with factors that predicted overweight and obesity status. Respondents living in poorer households were much more likely to be underweight than those living in households with higher socioeconomic status. The socioeconomic factors found to be significantly associated with underweight were partners education level, respondents occupation and the standard of living index. Respondents education was again not a significant variable in models of underweight.
In the models for underweight, the location variable retained significance when adjusting for all other explanatory variables. The introduction of the demographic, health and nutrition variables in models 2, 4 and 5 did not greatly alter the significance of the location variable. However, when the socioeconomic variables were introduced in model 6, a significant difference between large cities and smaller urban areas was no longer observed, although a significant difference between large cities and rural areas was maintained. Women living in the rural areas were significantly more likely to be underweight than those living in large cities.
| DISCUSSION |
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Factors associated with under- and overweight are similar. Women who
report a higher standard of living, who live in households where at
least one member is educated beyond high school, who work in nonmanual
occupations, or who watch television more than once a week are more
likely to be overweight or obese. These factors are all inversely
related with low BMI. In common with other studies in developing
countries that are in the early stage of nutrition transition, Indian
women in the highest socioeconomic groups are more likely to be
overweight or obese, whereas nearly half of poor women are underweight
(1
,3
,16
,29)
.
Although there were clear differences in weight status between women
living in rural and urban areas in the bivariate analyses, these
differences were either removed or reduced when controlling for
demographic, cultural, health behavior, diet and socioeconomic
variables. In particular, socioeconomic status, not rural/urban
residence, was the most important predictor of womens nutrition
status in India. Although larger proportions of urban women are
overweight or obese, we also observed that nearly 8% of rural women
fell into these categories. Given that 74% of the Andhra Pradesh
population is rural, the number of overweight rural women was larger
than among the urban sample, suggesting that the factors associated
with overweight and obesity are not restricted to the urban
environment. Our findings are consistent with Popkins perspective
that urban residence per se is not the cause of overweight; rather,
differences in lifestyle factors that predict overweight and obesity
are associated with living in an urban environment (15)
.
The data are also consistent with the urbanization literature in India,
which notes enhanced lifestyle, occupational and health opportunities
available to urban residents, factors that pull migrants from rural to
urban areas (30)
.
Our data confirm recent reports of a range of overweight and obesity
between 33 and 51% in the large cities of India and a rapid increase
in its prevalence over the last decade. Studies completed in the early
1990s reported prevalence rates between 3.5 and 4.1%, compared with
11% in NHFS II (20)
. At the same time, the prevalence of
undernutrition has changed only marginally (6
,8)
.
Urbanization has increased steadily since 1950 in India; the most rapid
period of growth was from 1971 when the proportion of the population
living in urban areas rose from 19 to 26% in 1991 (31)
.
Recent projections for central south Asia suggest that urbanization
will continue to grow, with 49% of the population living in urban
areas by 2030 (32)
. Given that many of the lifestyle
factors associated with overweight and obesity are found in urban
areas, and because in-migration to urban areas is growing
(33)
, an increasingly large proportion of the Indian
population will be at risk of overweight, obesity and associated
chronic diseases in the coming decades. Such factors include diets
higher in fat, increased consumption of animal products, superior
grains, sugar, and larger quantities of processed foods and meals eaten
outside of the home. Urban environments are also associated with less
physically demanding occupations, reductions in physical activity from
increased leisure time, occupational shifts and a lack of exercise
opportunities and facilities (1
,15
,34
36)
.
Sedentary lifestyles have been associated with the urban living
environment in India (17)
, and also with increased
probability of being overweight and obese (33)
. Although
the NFHS 2 did not include physical activity data, it did collect
information on womens occupational status and television viewing,
which are possible proxy variables for physical activity. Women who
watched television once a week were more likely to be overweight or
obese as were women who reported not working outside of the home. In
households with lower socioeconomic status, many poor women have little
choice in whether they work or stay at home and many must work in
manual occupations with high energy demands (37)
. These
households are less likely to have access to the resources to purchase
high energy or nutrient dense diets to meet their energy requirements.
Age was a significant predictor of BMI, with older women more likely to
be overweight or obese and younger women having a higher probability of
being underweight or severely thin, consistent with the findings of
other studies in developed and developing countries
(29
,38
40)
. Religion was also significantly associated
with being obese and overweight. In this sample, Muslim women were more
likely to be overweight or obese than Hindu women. This is likely
related to differences in diet, activity and socioeconomic status. We
are limited in our ability to explore these associations, although
there are likely to be differences in socioeconomic status between the
two groups that we were unable to control for in the models. The NFHS
data show that Muslims were significantly more likely to be found in
the higher socioeconomic groups (30% of Muslims in the high standard
of living group compared with 16% in the other religious groups) and
to live in urban areas of Andhra Pradesh (64% of Muslims live in urban
areas vs. 23% in the other religious groups). Although we do not have
good measures to explore this question, we hypothesize that Muslim
women may be more sedentary, based on lower rates of participation in
the workforce (80% of Muslims reported not working compared with 40%
in the other religious groups), a greater likelihood of watching
television at least once a week (78% of Muslims compared with 58% in
the other religious groups) and because of religious restrictions that
may limit their freedom of movement outside of the household
(41
,42)
. Therefore, it is possible that Muslim women have
lifestyles that increase their susceptibility to becoming overweight or
obese.
A limitation of our analysis is that many lifestyle factors cannot be fully explored using the NFHS 2 data. It is likely that the relationship between socioeconomic status and BMI would be greatly reduced when controlling for diet and lifestyle factors in the models. The survey did not collect information to estimate either energy intake or expenditure. With the limited dietary information available in the data set, we observed that women who more frequently ate fruits and other vegetables other than green leafy vegetables were more likely to be overweight. The NFHS 2 data showed that women who ate fruits and vegetables more frequently also lived in households with a higher standard of living index. These households were more likely to have the resources available to buy expensive fruits and vegetables, processed foods and to consume diets high in fat and sugar. It is therefore likely that frequent consumption of fruits and vegetables is a proxy measure for other aspects of socioeconomic status not captured in the standard of living index used.
What are the implications of the emerging nutrition transition and the
rapid change in overweight and obesity among the higher socioeconomic
groups in India? First, their risk of noncommunicable diseases, such as
heart disease, hypertension and adult onset diabetes is increased
(43)
. Second, it is hypothesized that in populations with
high rates of stunting and low birthweight, there may be an increased
risk of obesity-related chronic diseases in adulthood
(44
49)
. If this hypothesis is correct, India will face a
large public health challenge as children who were stunted become
overweight. At the same time, a large proportion of the population will
face a significant risk of morbidity and mortality related to
undernutrition (8)
. Others have noted the difficulty of
focusing resources on the dual problems of under- and overnutrition
(46)
. For India, the emerging nutrition transition has
enormous resource implications for future health and nutrition programs
and policies.
Although the factors associated with underweight, obesity and
overweight are very similar, the challenges and solutions required to
tackle the extremes of over- and underweight in the upper and lower
socioeconomic groups are not. Monteiro and colleagues suggest that as
the nutrition transition progresses, educated people within high
socioeconomic groups are the first to respond to nutrition education
messages and reduce their risk of obesity (1
,50)
. Hence,
providing health education messages and interventions for overweight
women in the higher socioeconomic groups on healthy diets and healthy
lifestyles might be effective in reducing the incidence of overweight
and obesity in this group. However, for the lower socioeconomic groups,
the challenges are far greater. Measham and Chatterjee (8)
suggest that one of the key causes of malnutrition among the poor in
India is a lack of access to sufficient food and resource inequities.
There is a need for continued commitment from the Indian government to
ensure food security for the poor and for long-term rural
development strategies. At the same time, information and programs for
rural women are needed to help them to understand the components of a
healthy diet and to ensure adequate access to health services
(8)
.
| ACKNOWLEDGMENTS |
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| FOOTNOTES |
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2 Supported by the Andrew. W. Mellon Foundation
(P.G.) and The Ford Foundation/India (M.B.). ![]()
4 Abbreviations used: BMI, body mass index; DHS,
Demographic and Health Survey; NFHS, National Family Health Survey;
UNICEF, United Nations International Childrens Emergency Fund. ![]()
5 The International Institute for Population
Sciences based in Mumbai, India coordinated the data collection with
technical assistance from MEASURE DHS+ at ORC Macro, Calverton, MD and
the East-West Center, Honolulu, HI. Researchers can apply for
permission to analyze the data through MEASURE DHS+; data collected in
all of the DHS surveys are available for analysis through their
website: www.measuredhs.com. The survey was approved by the
institutional review board at ORC Macro, and the entire questionnaire
and all of the procedures were approved by a multiagency technical
advisory committee in India, which considered human subject protections
and ethical issues. Informed consent was obtained from participants; to
take part in the survey; a separate, more detailed consent was obtained
for hemoglobin and lead measures [see (4)
, Chapter 10 and
appendix D]. The main objectives of the survey were to provide
estimates of fertility, family planning practices, infant and child
mortality, maternal and child health and nutrition, the utilization of
maternal and child health services, the quality of these services, the
status of women, womens reproductive health problems and domestic
violence. ![]()
6 The data from NFHS 2 are being made available
state by state by ORC Macro during 20002002. ![]()
7 All women were given the results of the
hemoglobin (Hb) test and had them explained to them. In addition, women
with severe anemia (Hb < 70 g/L) were read a statement asking
whether they would give permission for the health investigator to
inform a local health official about the problem. ![]()
8 We did not use the WHO (26)
overweight grade three definition of BMI
40 because this
applied only to three women in the Andhra Pradesh sample. ![]()
9 Because BMI values change substantially with age
in children and adolescents, Cole et al. (27)
developed a
range of age- and sex-specific cut-off points for overweight and
obesity in children and adolescents by linking adolescent and child BMI
cut-off points to those already in existence for adults. These
reference points use data from six large nationally representative
cross-sectional surveys. For the 15- to 17-y-old females in the
NFHS 2 sample we used the cut-off points recommended by Cole et al.
(27)
for adolescent obesity and overweight. For obesity,
these points are 29.29 for 15-y-old, 29.56 for 16-y-old and 29.84 for
17-y-old females. For overweight, the recommended cutoff points are
24.17 for 15-y-old, 24.54 for 16-y-old and 24.85 for 17-y-old females.
Normal weight categories used for adolescent females were 18.524.17
for 15-y-old, 18.524.54 for 16-y-old and 18.524.85 for 17-y-old
females. ![]()
10 In Table 3
we do not present the results of
model 4 because no health variables were found to be significant in
predicting overweight and obesity vs. normal weight. In Table 4
, we do
not present results of models 3 and 4 because no health or cultural
variables were found to be significantly associated with being
underweight vs. normal weight. ![]()
11 The standard of living index is a composite
index calculated by the International Institute of Population Sciences
and ORC Macro and is based upon household ownership of
possessions/consumer durables and land/livestock (4)
. ![]()
12 A large city is a capital city or city with a
population > one million; small cities have a population > 50,000 but < one million, and towns are areas classified as urban
by the Indian government. ![]()
Manuscript received April 30, 2001. Initial review completed June 11, 2001. Revision accepted July 17, 2001.
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