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close this bookThe Functional Significance of Low Body Mass Index (International Dietary Energy Consultative Group - IDECG, 1992, 203 pages)
close this folderThe body mass index of Chinese adults in the 1980s*
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View the documentIntroduction
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View the documentDiscussion

Methods

CNS-82

The 1982 China Nationwide Nutrition Survey covered 25 provinces and three municipalities, all administrative units directly under the control of central government with the exception of Tibet. A two-stage random sampling method was used to select the survey households. Four to 20 survey sites were chosen in each province/municipality by reference to its population size, and a cluster of 50 households were randomly sampled from each selected survey site. A total of 256 survey sites was finally chosen, including about 12000 households and 71000 individuals of all ages. In addition 546 institutional feeding units covering 166 000 individuals were surveyed, including factories, schools, kindergartens and governmental institutions etc.

Household dietary data were collected for 5 consecutive days. The change in the household inventory of food from the beginning to the end of the 5 survey days was assessed. This, and a weighed food survey of items used for preparing meals every day, was adopted to determine the household and institutional level of food consumption. Persons who participated in each meal were recorded in order to calculate the per caput food consumption.

Height, weight, arm circumference and midarm skinfold were measured in a portion of the sampled individuals. A clinical examination, blood and urine tests were also carried out in a small portion of the sampled subjects.

CHNS-89

The 1989 China Health and Nutrition Survey covered eight provinces (Liaoning, Shandong, Henan, Jiangsu, Hubei, Hunan, Guangxi and Guizhou). A multistage, random cluster process was used to draw the sample. Counties in the eight provinces were stratified by income, and four counties were randomly selected (one low-income, two middle-income and one high-income) in each province. Within each county, the township capital was selected and three villages were chosen randomly. In addition to the provincial capital, a lower-income city from each province was also chosen. The whole sample consisted of 188 primary survey sites, including 3780 households and covering about 16000 individuals.

Table 1. Body weight of Chinese adults (CNS-82)


Body weight (kg)





Percentiles


n

Mean

SD

10th

50th

90th

Men







All

6199

57.2

7.4

48.0

57.0

67.0

Urban

2879

58.9

7.4

50.0

58.4

68.2

Rural

3320

55.8

7 2

47.0

55.0

65.0

Women







All

7128

50.7

8.0

41.3

50.0

61.0

Urban

2630

52.4

8.3

43.0

51.9

63.0

Rural

4498

49.7

7.7

40.6

49.1

59.0


Fig. 1. Mean weight of Chinese adults (CNS-82).D Urban male; O rural male; D urban female; + rural female.


Fig. 2. Mean height of Chinese adults (CNS-82). Urban male; O rural male; D urban female; + rural female.

Household food consumption was determined from changes in the food inventory each day in combination with a weighing and measurement technique for foods used by the household for 3 days. In addition, the individual dietary intake was assessed on all children aged 1-6 years and on all adults aged 20-45 years for three consecutive days by a 24 h recall method.

Weight, height, arm circumference and midarm skinfold were measured for adults aged 20-45 years (in subsequent rounds of this CNNS panel the anthropometry of all age groups is being collected), and children's weight and stature were measured.