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Table 1 Characteristics of 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
1993 1997 2000 2004 2006 2009 2011
All participants 6782 7288 8227 7243 7236 6668 10,192
 Males n (%) 3235 (47.7) 3561 (48.9) 3936 (47.8) 3466 (47.9) 3418 (47.2) 3173 (47.6) 4777 (46.9)
 Age (year) 38.8 (12.87) 39.8 (12.68) 41.3 (12.37) 43.7 (12.01) 44.7 (11.80) 45.6 (12.08) 46.5 (11.99)
 BMI (kg/m2) 21.9 (2.81) 22.3 (3.04) 22.8 (3.16) 23.1 (3.28) 23.3 (3.50) 23.4 (3.40) 24 (4.18)
 WC (cm) 75.6 (8.93) 77.3 (9.22) 79.1 (9.69) 80.5 (9.74) 81 (9.78) 82.4 (10.25) 83.7 (11.09)
 SBP (mmHg) 113.9 (16.30) 116.8 (16.31) 117.7 (16.35) 119.9 (16.83) 119.5 (16.35) 121.9 (17.23) 122.5 (16.53)
 DBP (mmHg) 75 (10.78) 76.5 (10.60) 77.1 (10.73) 78.3 (11.01) 78.5 (10.65) 79.8 (10.91) 79.2 (10.54)
Urban 2047 2457 2717 2435 2367 2108 4085
 Males n (%) 972 (47.5) 1178 (47.9) 1291 (47.5) 1156 (47.5) 1121 (47.4) 995 (47.2) 1907 (46.7)
 Age (year) 40 (13.10) ** 40.1 (12.74) 41.9 (12.46) * 43.6 (12.36) 44.9 (12.12) 46 (12.25) 46.5 (12.22)
 BMI (kg/m2) 22.3 (2.95) ** 22.8 (3.21) ** 23.1 (3.21) ** 23.4 (3.35) ** 23.4 (3.28) * 23.5 (3.45) 24.1 (4.13)
 WC (cm) 77.5 (9.80) ** 78.4 (9.82) ** 79.9 (10.15) * 81.3 (10.01) * 81.6 (9.73) ** 82.6 (10.26) 83.6 (10.94)
 SBP (mmHg) 115.3 (17.26) 116.9 (16.91) 118 (16.42) 120.3 (16.95) 119.8 (15.99) 121.3 (16.68) 122.1 (15.58)
 DBP (mmHg) 76.2 (11.36) * 77 (10.76) ** 77.4 (10.96) 78.6 (10.68) 78.9 (10.27) * 79.9 (10.50) 78.8 (9.54) **
Rural 4735 4831 5510 4808 4869 4560 6107
 Males n (%) 2263 (47.8) 2383 (49.3) 2645 (48.0) 2310 (48.0) 2297 (47.2) 2178 (47.8) 2870 (47.0)
 Age (year) 38.3 (12.73) 39.7 (12.65) 41 (12.32) 43.7 (11.83) 44.7 (11.65) 45.5 (11.99) 46.4 (11.83)
 BMI (kg/m2) 21.7 (2.73) 22.1 (2.92) 22.7 (3.13) 23 (3.23) 23.2 (3.59) 23.3 (3.37) 24 (4.22)
 WC (cm) 74.8 (8.39) 76.7 (8.85) 78.8 (9.43) 80.2 (9.58) 80.7 (9.79) 82.2 (10.25) 83.7 (11.19)
 SBP (mmHg) 113.2 (15.82) 116.7 (15.99) 117.5 (16.31) 119.6 (16.76) 119.4 (16.53) 122.2 (17.47) 122.7 (17.13)
 DBP (mmHg) 74.5 (10.47) 76.2 (10.52) 76.9 (10.60) 78.2 (11.17) 78.2 (10.82) 79.7 (11.10) 79.5 (11.16)
  1. Values presented as numbers for arbitrary values and as the mean (SD) or n (%) for other variables
  2. Student’s t-test was applied to test the difference between urban and rural areas, * significant at 0.05, ** significant at 0.01