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Table 3 Age-standardized prevalence of central obesity * among Chinese adults with BMI < 23 kg/m 2

From: Increasing trends in central obesity among Chinese adults with normal body mass index, 1993–2009

  1993 1997 2000 2004 2006 2009 P for trend P
  n % (SE) n % (SE) n % (SE) n % (SE) n % (SE) n % (SE)  
Total 5060 7.6 (0.4) 5346 7.6 (0.4) 5281 10.2 (0.4) 4722 12.1 (0.5) 4485 11.5 (0.5) 4597 13.5 (0.6) < 0.001  
Men 2538 2.5 (0.3) 2695 2.2 (0.3) 2652 4.5 (0.4) 2274 5.8 (0.5) 2119 4.3 (0.5) 2160 4.9 (0.5) < 0.001 0.49
Women 2522 13.0 (0.7) 2651 13.3 (0.7) 2629 16.1 (0.8) 2448 18.2 (0.9) 2366 18.1 (0.9) 2437 21.2 (0.9) < 0.001
Age (years)               
  18-44 3228 4.9 (0.4) 3202 5.4 (0.4) 2941 7.6 (0.5) 2229 9.3 (0.6) 2054 8.9 (0.7) 1948 9.6 (0.7) < 0.001 0.18
  45-64 1351 11.1 (0.9) 1515 10.4 (0.8) 1665 13.0 (0.9) 1727 15.6 (1.0) 1629 14.6 (1.0) 1770 18.3 (1.0) < 0.001
  65-118 481 15.7 (1.8) 629 14.6 (1.5) 675 19.3 (1.7) 766 21.1 (1.7) 802 20.8 (1.6) 879 26.0 (1.7) < 0.001
Region               
  Urban 1407 10.5 (0.9) 1694 7.6 (0.7) 1640 10.8 (0.8) 1497 12.3 (0.9) 1432 12.3 (1.0) 1461 13.0 (1.0) < 0.001 < 0.0001
  Rural 3653 6.2 (0.4) 3652 7.2 (0.4) 3641 9.4 (0.5) 3225 11.5 (0.6) 3053 10.6 (0.6) 3136 12.9 (0.7) < 0.001
Education               
  Less than high school 4226 8.3 (0.5) 4347 8.3 (0.4) 4162 10.4 (0.5) 3690 12.6 (0.6) 3411 11.7 (0.6) 3441 14.3 (0.7) < 0.001 0.73
  High school 706 6.2 (1.2) 827 5.6 (0.9) 895 10.3 (1.1) 595 12.1 (1.6) 588 10.9 (1.5) 582 12.1 (1.8) < 0.001
  University 128 8.0 (2.5) 172 6.8 (2.0) 224 8.8 (2.0) 437 9.7 (1.5) 486 11.5 (1.5) 574 11.6 (1.4) < 0.001
  1. SE, standard error.
  2. * Central obesity is defined as waist circumference ≥ 90 cm for men and ≥ 80 cm for women.
  3. Trends in the prevalence of central obesity from 1993 to 2009 were assessed by Cochran-Armitage trend testing.
  4. P for interaction terms (survey × sex, survey × age, survey × rural/urban settings, and survey × education group) were assessed by logistic regression analysis.