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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

Characteristics

All subjects (12900)

Subgroup subjects

t/χ2

P

Non-hypertension (8593)

Hypertension (4307)

Age (year)a

38.14 ± 14.31

35.32 ± 13.52

43.75 ± 14.19

−32.320

<  0.001

BMI (kg/m2)a

21.78 ± 2.81

21.49 ± 2.70

22.34 ± 2.95

−15.810

<  0.001

Sex

   

90.032

<  0.001

 Male

5885 (45.62)

3667 (42.67)

2218 (51.50)

  

 Female

7015 (54.38)

4926 (57.33)

2089 (48.50)

  

Current smoking

   

153.265

<  0.001

 No

7369 (60.00)

5126 (64.00)

2243 (52.50)

  

 Yes

4913 (40.00)

2884 (36.00)

2029 (47.50)

  

Current drinking

   

121.351

<  0.001

 No

7123 (57.48)

4936 (61.05)

2187 (50.78)

  

 Yes

5269 (42.52)

3149 (38.95)

2120 (49.22)

  

Ethnicity

   

59.812

<  0.001

 Han

10,906 (84.54)

7115 (82.80)

3791 (88.02)

  

 Other

1994 (15.46)

1478 (17.20)

516 (11.98)

  

Physical activity

   

12.581

<  0.001

 No

12,268 (95.10)

8131 (94.62)

4137 (96.05)

  

 Yes

632 (4.90)

462 (5.38)

170 (3.95)

  

Obesityb

   

14.085

<  0.001

 Normal

9230 (71.55)

6477 (75.38)

2753 (63.92)

  

 Overweight

3181 (24.66)

1883 (21.91)

1298 (30.14)

  

 Obesity

489 (3.79)

233 (2.71)

256 (5.94)

  

Death

   

5.096

0.024

 No

11,935 (92.52)

7982 (92.89)

3953 (91.78)

  

 Yes

965 (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