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Table 2 Age-standardized prevalence (95% CI) of three types of obesity in Chinese adults, aged 18–65 years, by survey year and urban and rural areas in 1993–2011

From: Urban-rural-specific trend in prevalence of general and central obesity, and association with hypertension in Chinese adults, aged 18–65 years

  Survey year P for trend a
1993 1997 2000 2004 2006 2009 2011
All participants
 Central obesity only 15.8 (15.5–16.0) 18.0 (17.7–18.2) 21.8 (21.6–22.1) 23.7 (23.5–24.0) 25.0 (24.8–25.3) 27.9 (27.6–28.2) 30.3 (30.0–30.6) <.0001
 General obesity only 0.2 (0.2–0.3) 0.3 (0.2–0.3) 0.4 (0.4–0.4) 0.4 (0.4–0.5) 0.6 (0.5–0.6) 0.4 (0.4–0.5) 0.9 (0.9–1.0) <.0001
 Both central and general obesity 2.9 (2.8–3.0) 4.4 (4.3–4.6) 5.6 (5.5–5.8) 6.4 (6.3–6.6) 6.4 (6.2–6.5) 8.1 (8.0–8.3) 10.3 (10.1–10.5) <.0001
Urban
 Central obesity only 20.8 (20.6–21.1) ** 21.3 (21.0–21.6) ** 23.2 (23–23.5) ** 24.9 (24.6–25.2) ** 26.2 (25.9–26.4) ** 27.5 (27.2–27.8) * 29.6 (29.3–29.9) ** <.0001
 General obesity only 0.1 (0.1–0.2) ** 0.4 (0.3–0.4) ** 0.5 (0.5–0.6) ** 0.3 (0.3–0.3) ** 0.7 (0.6–0.7) ** 0.9 (0.8–0.9) ** 1.1 (1.1–1.2) ** <.0001
 Both central and general obesity 3.5 (3.4–3.6) ** 6.1 (5.9–6.2) ** 6.6 (6.4–6.7) ** 7.5 (7.3–7.6) ** 6.5 (6.4–6.7) * 8.7 (8.6–8.9) ** 10.0 (9.8–10.2) ** <.0001
Rural
 Central obesity only 13.4 (13.2–13.6) 16.3 (16.0–16.5) 21.1 (20.8–21.3) 23.2 (22.9–23.4) 24.5 (24.2–24.7) 28.0 (27.7–28.3) 30.6 (30.3–30.9) <.0001
 General obesity only 0.3 (0.2–0.3) 0.2 (0.2–0.2) 0.3 (0.3–0.4) 0.5 (0.5–0.5) 0.5 (0.4–0.5) 0.2 (0.2–0.3) 0.8 (0.7–0.9) <.0001
 Both central and general obesity 2.5 (2.4–2.6) 3.6 (3.5–3.7) 5.2 (5.0–5.3) 5.8 (5.7–6.0) 6.3 (6.1–6.4) 7.9 (7.7–8.0) 10.6 (10.4–10.8) <.0001
  1. CI confidence interval
  2. A chi-square test was applied to test the difference between urban and rural, * significant at 0.05, ** significant at 0.01
  3. aTrends in the prevalence of three types of obesity from 1993 to 2011 were assessed by Cochran-Armitage trend testing