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Table 1 Changes of BMI for 1264 men and 1768 women after an average 3.6-year follow-up

From: Risk factors for overweight and obesity, and changes in body mass index of Chinese adults in Shanghai

Population* N follow-up (month) BMI BMI ≥ 25 kg/m2
    mean ± SD n (%)
    Baseline Follow-up p Baseline Follow-up p
Men         
   25–34 y 54 36 24.5 ± 3.4 24.8 ± 3.4 0.091 23(42.6) 24(44.4) 0.903
   35–44 y 241 44 23.5 ± 3.2 23.9 ± 3.2 0.000 73(30.3) 85(35.3) 0.407
   45–54 y 267 47 23.8 ± 3.1 23.9 ± 3.0 0.332 92(34.5) 97(36.3) 0.755
   55–64 y 186 45 24.1 ± 3.0 24.1 ± 2.9 0.957 70(37.6) 68(36.6) 0.884
   65–74 y 315 43 24.4 ± 3.1 24.1 ± 3.3 0.016 136(43.2) 136(43.2) 1.000
   75–95 y 201 40 23.2 ± 3.5 22.8 ± 3.6 0.001 62(30.8) 62(30.8) 1.000
Women         
   25–34 y 51 35 22.1 ± 2.8 22.1 ± 2.7 0.755 9(17.6) 7(13.7) 0.642
   35–44 y 421 44 23.4 ± 3.2 23.7 ± 3.2 0.000 119(28.3) 130(30.9) 0.540
   45–54 y 443 47 24.1 ± 3.4 24.2 ± 3.4 0.329 168(37.9) 169(38.1) 1.000
   55–64 y 247 48 25.1 ± 3.5 25.0 ± 3.6 0.209 122(49.4) 119(48.2) 0.874
   65–74 y 386 45 25.0 ± 3.6 24.6 ± 3.6 0.000 196(50.8) 174(45.1) 0.347
   75–94 y 220 42 24.3 ± 4.0 23.7 ± 4.2 0.000 97(44.1) 80(36.4) 0.280
  1. *: age at baseline
  2. Mean differences were assessed by the paired t-test.
  3. Proportion differences were determined by the Chi-squared test.