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Table 1 Baseline characteristics according to sleep duration in ageing men

From: Sleep duration and incidence of lung cancer in ageing men

  Sleeping hours p-value
  ≤6.5 h 7-7.5 h ≥8 h
  (n = 501) (n = 1066) (n = 1019)  
Age (years) 54.3 (48.9-54.5) 54.3 (48.8-54.5) 54.3 (54.2-54.6) 0.075a
Smoking prevalence (%) 194 (38.7) 315 (29.5) 322 (31.6) <0.001b
Smoking (pack-years) 0 (0–378.0) 0 (0–81.9) 0 (0–204.0) 0.001a
Alcohol (g/wk) 34.2 (6.6-104.4) 31.9 (6.6-86.3) 27.8 (4.7-16.2) 0.208a
Physical activity (kcal/d) 80.1 (27.6-201.4) 84.9 (30.8-199.2) 85.0 (27.2-344.0) 0.831a
Body mass index (kg/m2) 26.6 (24.5-29.5) 26.2 (24.3-28.3) 26.8 (24.7-29.4) <0.001a
Education (years) 8.0 (6.0-10) 8.0 (6.0-10.0) 8.0 (6.0-9.0) <0.001a
HPL scores ≥5 (%) 68 (14.0) 84 (8.0) 79 (7.9) <0.001b
Family cancer history (%) 119 (23.8) 259 (23.8) 248 (24.3) 0.965b
Marital status (alone %) 35 (7.0) 62 (5.8) 73 (7.2) 0.425b
Night work (%) 113 (22.6) 160 (15.0) 181 (17.8) 0.001b
Unemployed/retired (%) 147 (29.3) 255 (23.9) 379 (37.2) <0.001b
Asthma (%) 15 (3.0) 34 (3.2) 43 (4.2) 0.341b
Chronic bronchitis (%) 48 (9.6) 65 (6.1) 69 (6.8) 0.040b
Frequent insomnia (%) 161 (33.0) 115 (10.9) 91 (9.1) <0.001b
Breathing disruptions (%) 84 (17.0) 116 (11.0) 119 (11.8) 0.003b
  1. Values are given as median (25th-75th percentile), or as n and proportion (%).
  2. aKruskal-Wallis median test.
  3. bχ 2 test.
  4. Abbreviations: HPL Human Population Laboratory Depression Scale.