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Table 2 Standardized means of body mass index and waist circumference in 1998–2001 and 2007–2008

From: Ten-year changes in the prevalence of overweight, obesity and central obesity among the Chinese adults in urban Shanghai, 1998–2007 — comparison of two cross-sectional surveys

Population N1 N2 BMI (kg/m2) Waist circumference (cm)
1998-2001 2007-2008 1998-2001 2007-2008 Differencee 1998-2001 2007-2008 Differencee
Standardized         
Overalla 4894 4395 23.3 23.6 0.2 77.7 79.9 1.4
Menb 2081 1599 23.5 24.1 0.5 81.1 83.9 2.6
Womenb 2813 2796 23.0 23.1 −0.1 74.1 75.7 1.3
p values for differencec    0.257 p < 0.001   p < 0.001 p < 0.001  
Sex- and age-specific         
Men         
 20-29 years 225 199 23.3 (4.2) 23.3 (3.8) 0 78.3 (11.1) 80.2 (10.7) 1.9
 30-39 years 406 235 23.2 (3.3) 24.3 (3.5) 1.1 80.4 (9.3) 83.5 (8.9) 3.1
 40-49 years 522 282 23.3 (3.1) 24.7 (3.1) 1.4 81.7 (9.4) 86.6 (8.7) 4.9
 50-59 years 284 457 24.1 (3.1) 24.4 (3.2) 0.3 83.9 (9.5) 85.8 (8.8) 1.9
 60-74 years 644 426 24.2 (3.2) 24.2 (3.0) 0 84.8 (9.5) 85.8 (9.0) 1
p values for linear trendd    p < 0.001 0.058   p < 0.001 p < 0.001  
Women         
 20-29 years 225 249 21.2 (3.0) 21.6 (3.1) 0.4 67.6 (7.7) 70.8 (7.8) 3.2
 30-39 years 561 427 22.8 (3.4) 22.8 (3.3) 0 73.0 (8.4) 73.8 (8.3) 0.8
 40-49 years 841 590 23.5 (3.2) 23.8 (3.2) 0.3 75.5 (8.3) 78.2 (8.5) 2.7
 50-59 years 385 968 24.5 (3.5) 24.1(3.4) −0.4 79.0 (9.2) 79.8 (8.7) 0.8
 60-74 years 801 562 25.2 (3.7) 24.5 (3.5) −0.7 82.8 (9.9) 82.0 (9.0) −0.8
p values for linear trendd    p < 0.001 p < 0.001   p < 0.001 p < 0.001  
  1. Data are expressed as the means (with standard deviations).
  2. Means were standardized by the direct method according to the Chinese population structure in 2000.
  3. aAdjusted for age and sex.
  4. bAdjusted for age.
  5. cDifferences in means were tested using an age-adjusted covariance analysis.
  6. dLinear trends for age-specific means were tested using linear regression analyses; age group was treated as a continuous variable.
  7. eThe differences are calculated as the mean for the 2007–2008 survey minus the mean for the 1998–2001 survey.
  8. Abbreviations: BMI: body mass index.