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Table 2 Characteristics of the population by nighttime-daytime sleep patterns

From: Association between nighttime-daytime sleep patterns and chronic diseases in Chinese elderly population: a community-based cross-sectional study

Variables Short nighttime sleep with daytime napping Short nighttime sleep without daytime napping Long nighttime sleep with daytime napping Long nighttime sleep without daytime napping P-value
No. subjects (%) 1314 938 1427 1061  
Age (years) 74.56 (6.89) 73.92 (6.91) 74.17 (7.21) 72.95 (7.09) < 0.001
Female (%) 715 (56.2) 591 (66.0) 717 (52.0) 521 (50.7) < 0.001
BMI (kg/m2) 24.17 (4.81) 24.12 (3.41) 24.42 (4.24) 28.78 (94.06) 0.055
Physical activity (Met·h/week) 37.88 (113.01) 40.65 (154.42) 33.65 (67.96) 43.41 (233.33) 0.549
Number of family members 2.61 (1.31) 2.54 (1.40) 2.49 (1.15) 2.64 (1.24) 0.014
Family income (yuan, RMB) 7326.32 (15,985.04) 6459.34 (5168.58) 7230.51 (9437.45) 7284.66 (9693.30) 0.344
Smoking status (%)      < 0.001
 Non-smoker 1050 (85.4) 758 (85.5) 1091 (81.3) 777 (78.5)  
 Ex-smoker 94 (7.6) 78 (8.8) 139 (10.4) 124 (12.5)  
 Current smoker 84 (6.8) 51 (5.7) 112 (8.3) 89 (9.0)  
Alcohol consumption (%)      0.784
 None or < once/month 1144 (89.4) 816 (88.6) 1239 (88.2) 917 (88.1)  
 Past alcohol drinker (>once/month) 113 (8.8) 88 (9.6) 137 (9.8) 110 (10.6)  
 Current alcohol drinker (>once/month) 22 (1.7) 17 (1.8) 27 (1.9) 14 (1.3)  
Any of chronic diseases (%) 965 (85.6) 720 (86.2) 1047 (83.6) 725 (79.8) 0.001
Diabetes (%) 201 (17.0) 162 (18.9) 261 (20.1) 190 (19.8) 0.233
CVD (%) 747 (56.8) 530 (56.5) 813 (57.0) 535 (50.4) 0.003
Dyslipidemia (%) 361 (27.5) 273 (29.1) 393 (27.5) 245 (23.1) 0.014
Cancer (%) 58 (5.1) 35 (4.1) 43 (3.4) 39 (4.2) 0.231
Arthritis (%) 237 (18.0) 152 (16.2) 205 (14.4) 102 (9.6) < 0.001
  1. Unless indicated otherwise, data are given as the mean ± SD or as number and percentages
  2. Abbreviations: BMI body mass index, PAL physical activity level