. 2019 May 30;19:661. doi: 10.1186/s12889-019-7018-4

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

	Survey year							P for trend ^a
	1993	1997	2000	2004	2006	2009	2011	P for trend ^a
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

CI confidence interval

A chi-square test was applied to test the difference between urban and rural, ^* significant at 0.05, ^** significant at 0.01

^aTrends in the prevalence of three types of obesity from 1993 to 2011 were assessed by Cochran-Armitage trend testing