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Table 1 Comparison of the baseline data between workers of EH group and control group

From: Effect of ACE, ACE2 and CYP11B2 gene polymorphisms and noise on essential hypertension among steelworkers in China: a case–control study

Factors Case, n (%) EH group (n = 224) Control group (n = 501) t/χ2/U P
Noise, n (%)     7.422 0.006
 No 473 130 (58.0) 343 (68.4)   
 Yes 252 94 (42.0) 158 (31.6)   
BMI (kg/m2), n (%)     72.117  < 0.001
 < 24 265 42 (18.7) 223 (44.5)   
 24–27 321 103 (46.0) 218 (43.5)   
 ≥ 28 139 79 (35.3) 60 (12.0)   
Marriage, n (%)     3.458 0.063
 No 67 14 (6.2) 53 (10.5)   
 Yes 658 210 (93.8) 448 (89.5)   
Education, n (%)     16.69  < 0.001
 Below university 518 183 (81.6) 335 (66.8)   
 University and above 207 41 (18.4) 166 (33.2)   
Income, n (%)     1.126 0.289
 < 3000 538 172 (76.7) 366 (73.0)   
 ≥ 3000 187 52 (23.3) 135 (27.0)   
Current shift status, n (%)     0.311 0.577
 No 224 66 (29.4) 158 (31.5)   
 Yes 501 158 (70.6) 343 (68.5)   
Family history of hypertension, n (%)     13.932  < 0.001
 No 482 127 (56.6) 355 (70.8)   
 Yes 243 97 (43.4) 146 (29.2)   
Smoking     0.952 0.329
 No 314 91 (40.6) 223 (44.5)   
 Yes 411 133 (59.4) 278 (55.5)   
Drinking     2.494 0.114
 No 582 172 (76.7) 410 (81.8)   
 Yes 143 52 (23.3) 91 (18.2)   
Eat fried food     2.364 0.124
 < 3 times/week 644 205 (91.5) 439 (87.6)   
 ≥ 3 times/week 81 19 (8.5) 62 (12.4)   
Eat meat     1.667 0.197
 < 3 times/week 421 138 (61.7) 283 (56.4)   
 ≥ 3 times/week 304 86 (38.3) 218 (43.6)   
Eat whole grains     0.110 0.741
 < 3 times/week 591 181 (80.8) 410 (81.8)   
 ≥ 3 times/week 134 43 (19.2) 91 (18.2)   
Eat vegetable     5.094 0.024
 < 3 times/week 139 54 (24.2) 85 (16.9)   
 ≥ 3 times/week 586 170 (75.8) 416 (83.1)   
Eat fruit     0.785 0.376
 < 3 times/week 274 90 (40.1) 184 (36.7)   
 ≥ 3 times/week 451 134 (59.9) 317 (63.3)   
Physical exercise     5.019 0.025
 < 3 times/week 166 63 (28.2) 103 (20.6)   
 ≥ 3 times/week 559 161 (71.8) 398 (79.4)   
Work pressure     0.005 0.945
 Smaller 448 138 (61.6) 310 (61.8)   
 Larger 277 86 (38.4) 191 (38.2)   
Family pressure     0.138 0.710
 Smaller 626 195 (87.0) 431 (86.0)   
 Larger 99 29 (13.0) 70 (14.0)   
Economic pressure     0.620 0.431
 Smaller 533 169 (75.4) 364 (72.6)   
 Larger 192 55 (24.6) 137 (27.4)   
Emotional stress     0.545 0.460
 Smaller 693 216 (96.4) 477 (95.2)   
 Larger 32 8 (3.6) 24 (4.8)   
Age (years)   40.86 ± 8.15 36.98 ± 8.08 41,213.500  < 0.001
Length of service   20.58 ± 9.45 16.35 ± 9.17 41,478.000  < 0.001
TG (mmol/L)   1.76 (1.34, 2.26) 1.36 (0.98, 2.06) 41,926.500  < 0.001
TC (mmol/L)   4.90 (4.30, 5.60) 4.70 (4.10, 5.30) 48,575.000 0.004
  1. BMI, body mass index; EH, essential hypertension; TC, total cholesterol; TG, triglyceride