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Table 1 General and occupational characteristics of study subjects by sleep duration

From: Factors related with quality on sleep of daytime workers

Variables Sleep duration Sleep duration
Mean ± SD p-valuea Fewer than 6 h Over than 6 h  
n (%) n (%) p-valueb
Age (in years)   0.384   0.009
 < 30 6.37 ± 1.03   102 (49.3) 105 (50.7)  
 30–39 6.41 ± 0.96   232 (44.4) 291 (55.6)  
 40–49 6.32 ± 0.97   144 (53.9) 123 (46.1)  
50 6.27 ± 1.09   87 (57.6) 64 (42.4)  
Sex   0.570   0.871
 Male 6.36 ± 0.95   516 (49.1) 534 (50.9)  
 Female 6.42 ± 1.32   49 (50.0) 49 (50.0)  
Working period (years)   0.502   0.776
5 6.43 ± 0.92   110 (47.2) 123 (52.8)  
 6–10 6.44 ± 0.99   74 (42.3) 101 (57.7)  
 11–15 6.38 ± 0.97   76 (46.6) 87 (53.4)  
16 6.57 ± 1.10   39 (44.8) 48 (55.2)  
Work type   0.006   0.004
 Blue-collar 6.42 ± 0.94   262 (44.9) 322 (55.1)  
 Office worker 6.38 ± 1.09   152 (52.2) 139 (47.8)  
 Researcher 6.17 ± 0.94   116 (57.4) 86 (42.6)  
Smoking   0.171   0.580
 Non-smoker 6.42 ± 1.02   230 (46.8) 261 (53.2)  
 Ex-smoker 6.44 ± 1.05   116 (47.5) 128 (52.5)  
 Current-smoker 6.31 ± 0.89   172 (50.4) 169 (49.6)  
Alcohol drinking   0.703   0.481
 Non-drinker 6.42 ± 1.04   57 (44.9) 70 (55.1)  
 1/week 6.40 ± 0.97   241 (47.3) 269 (52.7)  
 Over 2/week 6.36 ± 0.99   220 (50.2) 218 (49.8)  
Exercise   0.187   0.238
 No 6.41 ± 1.00   332 (46.9) 376 (53.1)  
 Yes 6.33 ± 0.95   186 (50.7) 181 (49.3)  
BMI (kg/m2)c   0.308   0.186
 < 23 6.43 ± 0.97   179 (44.9) 220 (55.1)  
 23–25 6.37 ± 0.99   152 (49.7) 154 (50.3)  
 25–30 6.30 ± 1.00   204 (52.4) 185 (47.6)  
30 6.30 ± 1.14   25 (52.1) 23 (47.9)  
Metabolic syndrome   0.115   0.021
 No 6.38 ± 0.96   477 (47.7) 522 (52.3)  
 Yes 6.24 ± 1.20   83 (58.0) 60 (42.0)  
Musculoskeletal Pain   0.058   0.126
 No 6.39 ± 0.96   430 (48.2) 463 (51.8)  
 Yes 6.24 ± 1.11   100 (54.3) 84 (45.7)  
  1. aCalculated using t-test and ANOVA
  2. bCalculated using chi-square test
  3. cBMI Body Mass Index