Quick Search
  Home Journal Information Current Issue Past Issues Services Contact Us  
Articles
Prevalence and regional distribution of childhood overweight and obesity in Shandong Province, China 
 
Prevalence and regional distribution of childhood overweight and obesity in Shandong Province, China
  Ying-Xiu Zhang, Shu-Rong Wang
 [Abstract] [Full Text] [PDF]   Pageviews: 11020 Times
   

Prevalence and regional distribution of childhood overweight and obesity in Shandong Province, China

Ying-Xiu Zhang, Shu-Rong Wang

Jinan, China

Author Affiliations: Shandong Center for Disease Control and Prevention, Jinan, China (Zhang YX); Shandong Blood Center, Jinan, China (Wang SR)

Corresponding Author: Ying-Xiu Zhang, Shandong Center for Disease Control and Prevention, 16992 Jingshi Road, Jinan 250014, China (Tel: +86-0531-82679413; Fax: +86-0531-82679708; Email: sdcdczyx@163.com)

doi: 10.1007/s12519-012-0392-y

Background: The rising prevalence of childhood obesity was observed in China. This study assessed the prevalence and district distribution of childhood obesity in Shandong Province, China.

Methods: A cross-sectional study was conducted in the province. A total of 42 275 students (21 222 boys and 21 053 girls) aged 7-18 years from 16 districts participated in this study. Height and body weight of all subjects were measured, and the body mass index (BMI) was calculated. The prevalence of overweight and obesity was obtained according to the International Obesity Task Force (IOTF) cut-offs.

Results: In 2010, the prevalence rates of combined overweight and obesity reached 26.86% in urban boys, 18.32% in rural boys, 14.36% in urban girls, and 11.31% in rural girls, respectively. An increasing trend was observed in the prevalence of overweight and obesity from the low socioeconomic status (SES) group to the moderate and high SES groups. The prevalence  rates of combined overweight and obesity in the three SES groups were 18.46%, 21.08% and 27.31% in boys and 10.43%, 12.42% and 15.18% in girls, respectively.

Conclusions: There is a high level of overweight and obesity among children and adolescents in Shandong Province, China. The distribution of childhood obesity is positively associated with the regional SES.

Key words: child and adolescent; district difference; prevalence; obesity; overweight

World J Pediatr 2013;9(2):135-139


Introduction

The prevalence of childhood overweight and obesity has increased in developed countries and in many parts of developing countries.[1,2] Because of the rapid increase of prevalence rates, its severe co-morbidities, and costly consequences, obesity has become an increasingly important public health problem in children and adolescents.[3] The rising prevalence of childhood obesity has also been observed in China.[4-7] In 2005, a study reported geographic differences in childhood obesity prevalence rates: the prevalence rates of combined overweight and obesity among children and adolescents aged 7-18 years vary from 5.0% to 32.5% in boys and 3.9% to 17.6% in girls of the western rural region and northern coastal cities of China, respectively.[8]

Shandong Province is an important eastern littoral province with a population of 95.79 million in 2010. The present study aimed to analyze the prevalence and district distribution of childhood overweight and obesity in Shandong Province, China.

Methods

The study was approved by the Ethical Committee of the Shandong Center for Disease Control and Prevention.

Study population

In 2010, a cross-sectional study was conducted in Shandong Province. A total of 42 275 students aged 7-18 years (21 222 boys and 21 053 girls) from 16 districts in Shandong Province participated in the study. All students voluntarily joined this study and provided written informed consent. The sampling method was a stratified multistage sampling based on selected primary and secondary schools. The information about gross domestic product (GDP) per capita of the 16 districts in 2010 was obtained from the official website of Shandong Provincial Statistics Bureau (http://www.stats.com.cn/tjsj/tjsj.asp). The 16 districts were divided into three groups [high socioeconomic status (SES), moderate SES and low SES] according to their GDP per capita in 2010. High SES was defined as GDP per capita above 8000 dollars (including Jinan, Qingdao, Yantai, Weihai and Dongying), moderate SES was defined as GDP per capita above 5000 but below 8000 dollars (including Zibo, Weifang, Taian, Laiwu, Binzhou and Jining), and low SES was defined as GDP per capita below 5000 dollars (including Rizhao, Dezhou, Liaocheng, Linyi and Heze). To show the district distribution of obesity prevalence, all sub-populations were re-divided into six regions: a) high SES urban areas; b) moderate SES urban areas; c) low SES urban areas; d) high SES rural areas; e) moderate SES rural areas; and f) low SES rural areas.

Measurements

All measurements were conducted by a team of trained technicians in each of the 16 districts. Each technician was required to pass a training course for anthropometric measurement organized by the investigation team in Shandong Province. All measurements were taken using the same type of apparatus and followed the same procedures recommended by Cameron.[9] Metal column height-measuring stands (each 200 cm long with 0.1 cm precision) were used to measure height. The subjects were required to stand straight on the instruments barefoot and comfortably. Weight was measured with lever scales (each weighs 120 kg with 0.1 kg precision) while the subjects wore their underwear only.

Statistical analyses

Body mass index (BMI) was calculated (weight in kilograms divided by the square of height in meters), and the prevalence rates of overweight and obesity were obtained according to the International Obesity Task Force (IOTF) cut-offs.[10] The ratio of overweight to obesity in each group was determined, and overweight and obesity frequencies among different groups were compared by the chi-square test. Analyses were made with the statistical package SPSS/PC+ version 11.5. P<0.05 was considered statistically significant.

Results

Prevalence of overweight and obesity

Table 1 shows the prevalence of overweight and obesity among children and adolescents aged 7-18 years in Shandong Province. In 2010, the overall prevalence of overweight was 18.81% (urban boys), 13.54% (rural boys), 11.94% (urban girls) and 9.54% (rural girls), respectively (¦Ö2=421.26, P<0.001). The overall prevalence of obesity was 8.05% (urban boys), 4.78% (rural boys), 2.42% (urban girls) and 1.77% (rural girls), respectively (¦Ö2=629.12, P<0.001). There was a great variation between different sub-populations with the highest prevalence of combined overweight and obesity noted for the urban boys (26.86%), in the middle field the rural boys (18.32%) as well as the urban girls (14.36%), and with the lowest prevalence for the rural girls (11.31%) (Fig. 1).

SES variation in overweight/obesity prevalence

There were significant differences in the prevalence of overweight and obesity among children and adolescents in different SES groups. The overall prevalence of overweight in the three SES groups (low, moderate, high) were 13.76%, 16.04% and 18.26% in boys (¦Ö2=52.17, P<0.001), and 8.92%, 10.38% and 12.55% in girls (¦Ö2=49.14, P<0.001), respectively. The overall prevalence of obesity in the three SES groups were 4.70%, 5.04% and 9.05% in boys (¦Ö2=143.79, P<0.001), and 1.51%, 2.04% and 2.63% in girls (¦Ö2=21.29, P<0.001), respectively. Fig. 2 shows the prevalence of combined overweight and obesity by age in different SES groups: an increasing trend was observed from the low SES group to the moderate and high SES groups in all age groups (7-18 years). The average prevalence rates were 18.46%, 21.08% and 27.31% in boys (¦Ö2=170.51, P<0.001), and 10.43%, 12.42% and 15.18% in girls (¦Ö2=71.64, P<0.001), respectively.

Table 2 shows that the prevalence of combined overweight and obesity in high SES urban areas was 31.59% in boys and 16.74% in girls (7-18 years) and thereby much higher compared to the other SES groups. The prevalence of both overweight and obesity was the highest in the high SES urban areas (20.55%, 11.04% for boys and 13.84%, 2.90% for girls), and lowest in the low SES rural areas (10.52%, 2.53% for boys and 7.74%, 0.98% for girls).

Discussion

In 2010, the prevalence of combined overweight and obesity among school children and adolescents was found to be 22.63% (boys) and 12.85% (girls) respectively. Thus, the prevalence of obesity/overweight in Shandong Province, China has already approached that in developed countries.[11,12] Because substantial socioeconomic and urban-rural disparities exist in childhood obesity/overweight, the prevalence of combined overweight and obesity varied from 31.59% in the high SES urban boys to 8.72% in the low SES rural girls.

A previous study[13] confirmed that the population distribution of childhood obesity is associated with SES, and the patterns vary from country to country.Studies[14-19] from developed countries showed that high SES youths are less likely to be obese than their lower SES counterparts. In contrast, in developing countries such as Indonesia, Brazil and China, high SES youths are more likely to be obese than their lower SES counterparts.[8,20,21] The reasons are quite complex and may be related to the local socioeconomic status, process of urbanization, living environments, nutritional status, dietary pattern and physical activity.

Similarly, reports[22,23] from developed countries showed that rural children have a higher risk of overweight and obesity compared with urban children, while developing countries report a reverse association.[8,24] This study indicated that boys and girls from urban areas were more likely to be obese than their peers from rural areas which may be related to the urban-rural difference in SES, living conditions and lifestyle. In 2010, the income per capita and Engel's coefficient were 19 946 RMB and 0.32 for urban residents and 6990 RMB and 0.38 for rural residents in Shandong Province, respectively (http://www.stats.com.cn/tjsj/tjsj.asp). A Chinese national study[25] reported that urban youths spend 0.8 more hours every day on sedentary activity than their rural counterparts. Compared to rural families, urban families own more televisions, video disc players and computers.[26] It makes urban children have more time for watching TV, playing video games and less time for physical activity than rural children. A study has shown that 80% of students do daily physical exercise less than one hour in Shandong Province, China. The short duration of physical activity may be an important cause that leads to a rapid increase in the prevalence of overweight and obesity.[27]

The traditional Chinese diet is shifting towards a diet with high fat, high energy density and low dietary fiber. These changes resulted in rapid increases in the prevalence of overweight and obesity and dietary-related chronic non-communicable diseases.[28] In the mainland of China, the annual energy contribution from fat is increasing, with the individual daily consumption of animal products increasing from 66 to 167 grams in rural areas, and from 114 to 215 grams in urban areas between 1982 and 2002.[29] In Shandong Province, the individual daily intake of fat and percentage energy from fat increased from 54.4 grams and 21.1% in 1992 to 83.1 grams and 36.2% in 2002, respectively.[30]

The strength of this study is that the database comes from a large representative sample of children and adolescents in Shandong Province, China. We reported the prevalence of overweight and obesity by IOTF reference norm, which allows comparison with similar studies performed in other countries. However, this study has several limitations. The absence of detailed information at the individual level limited our study. Lack individual SES information probably underestimated the true effects of SES on obesity.

In summary, this study demonstrated that the prevalence of childhood obesity/overweight is wide in Shandong Province, one of the populous provinces in China. The distribution of childhood obesity is positively associated with the regional SES, indicating that children and adolescents from more developed districts are more likely to be obese than those from less developed districts.

Acknowledgements

Surveys on students' constitution and health are conducted under the auspices of the Department of Education in Shandong Province, China. We are grateful to all the team members and participants. Special thanks are also given to Mr. B Yu and Mr. HY Xu for providing the survey data.

Funding: This research was supported by medical and health program of Shandong (2009-HE049).

Ethical approval: The study was approved by the Ethical Committee of the Shandong Center for Disease Control and Prevention.

Competing interest: There are no conflicts of interest on behalf of any of the authors.

Contributors: Zhang YX designed the study and wrote the first draft. Wang SR conducted the statistical analysis. The final manuscript was approved by all the authors.

References

1   Popkin BM, Doak CM. The obesity epidemic is a worldwide phenomenon. Nutr Rev 1998;56:106-114.

2   Wang Y, Lobstein T. Worldwide trends in childhood overweight and obesity. Int J Pediatr Obes 2006;1:11-25.

3   Lobstein T. Obesity in children and young people: a crisis in public health. Obes Rev 2004;5(Suppl 1):4-85.

4   Ji CY, Cheng TO. Epidemic increase in overweight and obesity in Chinese children from 1985 to 2005. Int J Cardiol 2009;132:1-10.

5   Zhang YX, Wang SR. Distribution of body mass index and the prevalence changes of overweight and obesity among adolescents in Shandong, China from 1985 to 2005. Ann Hum Biol 2008;35:547-555.

6   Liou TH, Huang YC, Chou P. Prevalence and secular trends in overweight and obese Taiwanese children and adolescents in 1991-2003. Ann Hum Biol 2009;36:176-185.

7   Chan C. Childhood obesity and adverse health effects in Hong Kong. Obes Rev 2008;9 (Suppl 1):87-90.

8   Ji CY, Cheng TO. Prevalence and geographic distribution of childhood obesity in China in 2005. Int J Cardiol 2008;131:1-8.

9   Cameron N. The methods of auxological anthropometry. In: Falkner F, Tanner JM, eds. Vol. 2. Human growth, 1st ed. New York: Plenum Press, 1978: 35-90.

10 Cole TJ, Bellizzi MC, Flegal KM, Dietz WH. Establishing a standard definition for child overweight and obesity worldwide: international study. BMJ 2000;320:1240-1243.

11 Janssen I, Katzmarzyk PT, Boyce WF, Vereecken C, Mulvihill C, Roberts C, et al. Comparison of overweight and obesity prevalence in school-aged youth from 34 countries and their relationships with physical activity and dietary patterns. Obes Rev 2005;6:123-132.

12 Livingstone BL. Epidemiology of childhood obesity in Europe. Eur J Pediatr 2000;159(Suppl 1):S14-34.

13 Mclaren L. Socioeconomic status and obesity. Epidemiol Rev 2007;29:29-48.

14 Oliver LN, Hayes MV. Neighbourhood socio-economic status and the prevalence of overweight Canadian children and youth. Can J Public Health 2005;96:415-420.

15 Janssen I, Boyce WF, Simpson K, Pickett W. Influence of individual and area-level measures of socioeconomic status on obesity, unhealthy eating, and physical inactivity in Canadian adolescents. Am J Clin Nutr 2006;83:139-145.

16 Nelson MC, Gordon-Larsen P, Song Y, Popkin BM. Built and social environments associations with adolescent overweight and activity. Am J Prev Med 2006;31:109-117.

17 Shrewsbury V, Wardle J. Socioeconomic status and adiposity in childhood: a systematic review of cross-sectional studies 1990-2005. Obesity 2008;16:275-284.

18 Lovasi GS, Hutson MA, Guerra M, Neckerman KM. Built environments and obesity in disadvantaged populations. Epidemiol Rev 2009;31:7-20.

19 Singh GK, Siahpush M, Kogan MD. Rising social inequalities in US childhood obesity, 2003-2007. Ann Epidemiol 2010;20:40-52.

20 Julia M, van Weissenbruch MM, de Waal HA, Surjono A. Influence of socioeconomic status on the prevalence of stunted growth and obesity in prepubertal Indonesian children. Food Nutr Bull 2004;25:354-360.

21 Arteaga H, Dos Santos JE, Dutra de Oliveira JE. Obesity among schoolchildren of different socioeconomic levels in a developing country. Int J Obes 1982;6:291-297.

22 Davis AM, Bennett KJ, Befort C, Nollen N. Obesity and related health behaviors among urban and rural children in the United States: Data from the National Health and Nutrition Examination Survey 2003-2004 and 2005-2006. J Pediatr Psychol 2011;36:669-676.

23 Bertoncello C, Cazzaro R, Ferraresso A, Mazzer R, Moretti G. Prevalence of overweight and obesity among school-aged children in urban, rural and mountain areas of the Veneto Region, Italy. Public Health Nutr 2008;11:887-890.

24 Mohan B, Kumar N, Aslam N, Rangbulla A, Kumbkarni S, Sood NK, et al. Prevalence of sustained hypertension and obesity in urban and rural school going children in Ludhiana. Indian Heart J 2004;56:310-314.

25 Liu AL, Li YP, Cui CH, Hu XQ, Luan DC, Ma GS. Analysis on average time of physical activity in a school day among Chinese students. Chin J School Health 2006;27:473-475. [In Chinese]

26 Shandong Provincial Bureau of Statistics. Shandong Statistical Yearbook 2010. Beijing: China Statistics Press, 2010: 298-315. [In Chinese]

27 Zhang YX. Physical activity attitude and the related daily schedule among students in Shandong. Chin J Sch Health 2008;29:124-126. [In Chinese]

28 Du SF, Lv B, Wang ZH, Zhai FY. Transition of dietary pattern in China. J Hyg Res 2001;30:221-225. [In Chinese]

29 Zhai FY, Yang XG. Report on national survey of nutrition and health status in 2002: diet and nutrient intake status. Beijing: People's Health Press, 2006: 23-27. [In Chinese]

30 Zhou JY, Zhang JL. Dietary nutrition and health status of Shandong population. Jinan: Shandong Electronic Audio & Video Publishing House, 2008: 10-32. [In Chinese]

Received December 21, 2011 Accepted after revision February 23, 2012

 

 
  [Articles Comment]

  title Author The End Revert Time Revert / Count

  Username:
  Comment Title: 
 
   

 

     
 
     
World Journal of Pediatric Surgery

roger vivier bags 美女 美女

Home  |  Journal Information  |  Current Issue  |  Past Issues  |  Journal Information  |  Contact Us
Children's Hospital, Zhejiang University School of Medicine, China
Copyright 2007  www.wjpch.com  All Rights Reserved Designed by eb