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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.