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Table 1 General characteristics of study subjects

From: The relationship between quality of sleep and night shift rotation interval

Variables Group A Group B Group C P-valuea
Number (%) Number (%) Number (%)
Age     <0.001
 20’s 365 (84.7) 1,371 (89.2) 664 (78.1)  
 30’s 66 (15.3) 166 (10.8) 186 (21.9)  
Marital status     <0.001
 Unmarried 320 (74.2) 1,311 (85.3) 737 (86.7)  
 Married 110 (25.5) 222 (14.4) 110 (12.9)  
 Divorced 1 (00.2) 4 (00.3) 3 (00.4)  
Education Level     <0.001
  ≤ High school 261 (60.6) 1,000 (65.1) 637 (74.9)  
  ≥ College 170 (39.4) 537 (34.9) 213 (25.1)  
Smoking     <0.001
 No 412 (95.6) 1,492 (97.1) 676 (79.5)  
 Current 19 (04.4) 45 (02.9) 174 (20.5)  
Alcohol consumption     <0.001
 No 219 (50.8) 799 (52.0) 339 (39.9)  
 Mild 114 (26.5) 418 (27.2) 276 (32.5)  
 Moderate 98 (22.7) 340 (22.1) 235 (27.6)  
Obesity (BMI)     0.062
 18.5–24.9 322 (74.7) 1,122 (73.0) 581 (68.4)  
  < 18.5 51 (11.8) 200 (13.0) 119 (14.0)  
  ≥ 25.0 58 (13.5) 215 (14.0) 150 (17.6)  
Exercise     0.005
  < 3 times per weeks 158 (36.7) 610 (39.7) 384 (45.2)  
  ≥ 3 times per weeks 273 (63.3) 927 (60.3) 466 (54.8)  
Sleep during working     <0.001
 No 12 (02.8) 154 (10.0) 431 (23.6)  
 Yes 419 (97.2) 1,383 (90.0) 1,537 (76.4)  
Job tenure     <0.001
  < 5 years 97 (22.5) 798 (51.9) 338 (39.8)  
 5–9 years 181 (42.0) 384 (25.0) 293 (34.5)  
  ≥ 10 years 153 (35.5) 355 (23.1) 219 (25.8)  
Job tenure (Shift work)     <0.001
  < 5 years 100 (23.2) 811 (52.8) 341 (40.1)  
 5–9 years 198 (45.9) 425 (27.7) 354 (41.6)  
  ≥ 10 years 133 (35.9) 301 (19.6) 155 (18.2)  
  1. acomparison by chi-squared test