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Table 1 General characteristics of subjects at baseline

From: Effect of shift work on hypertension: cross sectional study

  Non-shift workers (n = 878) Shift workers (n = 1,075) p value
Age (years) 43.1 ± 9.3 42.5 ± 7.7 0.099
Height (cm) 172.7 ± 5.3 173.0 ± 5.2 0.182
Weight (kg) 72.1 ± 8.6 73.1 ± 8.7 0.011
Body Mass Index (kg/m2) 24.2 ± 2.4 24.4 ± 2.5 0.023
Systolic Blood Pressure (mmHg) 121.0 ± 11.4 122.4 ± 12.0 0.012
Diastolic Blood Pressure (mmHg) 72.2 ± 8.5 73.7 ± 9.1 <0.001
High risk alcohol drinka
 No 561 (63.9) 740 (68.8) 0.021
 Yes 317 (36.1) 335 (31.2)  
Adequate exerciseb
 No 601 (68.5) 595 (55.3) <0.001
 Yes 277 (31.5) 480 (44.7)  
Smoking status
 Non-smoker 248 (28.2) 271 (25.2) 0.132
 Ex-smoker 317 (36.1) 433 (40.3)  
 Current smoker 313 (35.6) 371 (34.5)  
Hypertension
 No 794 (90.4) 944 (87.8) 0.066
 Yes 84 (9.6) 131 (12.2)  
  1. Unit: mean ± standard deviation, number (percentage)
  2. p-value was calculated by Student t test for continuous variables
  3. p-value was calculated by Chi-square test for categorical variables
  4. aHigh risk alcohol drink: drink more than 2 times per week and more than 7 glasses per one time
  5. bAdequate exercise: exercise harder than daily activity for more than 30 min and exercise more than 3 times per week