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Table 1 The characteristics of all subjects at baseline

From: BMI modified the association of current smoking with the incidence of hypertension in Chinese population: a 22-year cohort study

CharacteristicsAll subjects (12900)Subgroup subjectst/χ2P
Non-hypertension (8593)Hypertension (4307)
Age (year)a38.14 ± 14.3135.32 ± 13.5243.75 ± 14.19−32.320<  0.001
BMI (kg/m2)a21.78 ± 2.8121.49 ± 2.7022.34 ± 2.95−15.810<  0.001
Sex   90.032<  0.001
 Male5885 (45.62)3667 (42.67)2218 (51.50)  
 Female7015 (54.38)4926 (57.33)2089 (48.50)  
Current smoking   153.265<  0.001
 No7369 (60.00)5126 (64.00)2243 (52.50)  
 Yes4913 (40.00)2884 (36.00)2029 (47.50)  
Current drinking   121.351<  0.001
 No7123 (57.48)4936 (61.05)2187 (50.78)  
 Yes5269 (42.52)3149 (38.95)2120 (49.22)  
Ethnicity   59.812<  0.001
 Han10,906 (84.54)7115 (82.80)3791 (88.02)  
 Other1994 (15.46)1478 (17.20)516 (11.98)  
Physical activity   12.581<  0.001
 No12,268 (95.10)8131 (94.62)4137 (96.05)  
 Yes632 (4.90)462 (5.38)170 (3.95)  
Obesityb   14.085<  0.001
 Normal9230 (71.55)6477 (75.38)2753 (63.92)  
 Overweight3181 (24.66)1883 (21.91)1298 (30.14)  
 Obesity489 (3.79)233 (2.71)256 (5.94)  
Death   5.0960.024
 No11,935 (92.52)7982 (92.89)3953 (91.78)  
 Yes965 (7.48)611 (7.11)354 (8.22)  
  1. aThese variables were analyzed using t test
  2. bThis variable was analyzed using Wilcoxon rank sum test