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Table 1 Sleep duration among different population groups

From: Social-biological influences on sleep duration among adult residents of Northeastern China

Characteristics N (%) Sleep duration(h) \( \overline{x} \)± s F P
Sex
 Male 10,337 (48.2) 7.26±1.491 1.83 0.067
 Female 11,098 (51.8) 7.22±1.597
Age
 Young 9043 (42.2) 7.50±1.331 353.95 < 0.001
 Middle age 8277 (38.6) 6.90±1.557
 Elderly 4115 (19.2) 6.86±1.777
Ethnicity
 Han 19,865 (92.7) 7.25±1.543 3.47 0.001
 Others 1570 (7.3) 7.10±1.458
Place of residence
 Urbanite 11,152 (52.0) 7.14±1.447 9.21 < 0.001
 Countryside 10,283 (48.0) 7.37±1.623
Marital status
 Marriage /Cohabitation 18,316 (85.4) 7.22±1.524 65.44 < 0.001
 Unmarried 1693 (7.9) 7.57±1.344
 Divorce/Divorcee/Separated spouse 388 (1.8) 6.83±1.589
 Widow/ Widower 1038 (4.8) 6.63±1.854
Occupation
 Manual worker 12,046 (56.2) 7.30±1.560 22.19 < 0.001
 Mental worker 4211 (19.6) 7.27±1.246
 Others 5178 (24.2) 7.01±1.672
Educational level
 Primary school or below 6236 (29.1) 7.11±1.816 19.89 < 0.001
 Junior middle school 6125 (28.6) 7.32±1.488
 Senior middle school 5559 (25.9) 7.18±1.433
 Undergraduate or above 3515 (16.4) 7.34±1.190
Average monthly income (¥)
 < 500 4304 (20.1) 7.18±1.726 7.55 0.001
 500- 14,149 (66.0) 7.22±1.610
 3000- 2140 (10.0) 7.35±1.464
  1. Mean and standard deviation has been adjusted by complex weighed computation in sleep duration