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Table 1 Characteristics of the study participants

From: Road traffic noise frequency and prevalent hypertension in Taichung, Taiwan: A cross-sectional study

Characteristics Case groupa Control group Total subjects P-value
(n = 46) (n = 774) (n = 820)
Age (years)     
 Mean ± SD 49.3 ± 11.6 35.2 ± 12.5 36.0 ± 12.8 <0.001b
Body mass index (kg/m2)    
 Mean ± SD 25.5 ± 4.3 22.3 ± 3.5 22.5 ± 3.6 <0.001b
Gender     
 Male (%) 25 (54.4) 296 (38.2) 321 (39.2) 0.030c
Current smoker     
 Yes (%) 12 (26.1) 175 (22.6) 187 (22.8) 0.585c
Alcohol drinking     
 Yes (%) 9 (19.6) 83 (10.7) 92 (11.2) 0.065c
Tea consumption     
 Yes (%) 30 (65.2) 508 (65.6) 538 (65.6) 0.954c
Coffee consumption    
 Yes (%) 16 (34.8) 294 (38.0) 310 (37.8) 0.664c
Salt intake     
 High (%) 16 (34.8) 194 (25.1) 210 (25.6) 0.142c
Regular exercise     
 Yes (%) 25 (54.4) 383 (49.5) 408 (49.8) 0.522c
Family history of hypertension    
 Yes (%) 36 (78.3) 240 (31.0) 276 (33.7) <0.001c
  1. SD = standard deviation. aSubjects had the previous diagnosis of hypertension while living at the current address. bWilcoxon signed rank sum test of the difference between the two groups. cChi-square test of the difference between the two groups.