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Table 2 Characteristics of study in the endpoint

From: Insomnia as an independent predictor of suicide attempts: a nationwide population-based retrospective cohort study

  Total With insomnia Without insomnia P-value
Variables n % n % n %
Total 479,967 100.0 159,989 33.3 319,978 66.7  
Suicide attempts        < 0.001
 with 1395 0.3 1098 0.7 297 0.1  
 without 478,572 99.7 158,891 99.3 319,681 99.9  
Gender        0.880
 male 235,771 49.1 78,615 49.1 157,156 49.1  
 female 244,196 50.9 81,374 50.9 162,822 50.9  
Age group (years)        0.958
 15–24 15,901 3.3 5330 3.3 10,571 3.3  
 25–44 99,058 20.6 33,030 20.6 66,028 20.6  
 45–64 172,650 36.0 57,504 35.9 115,146 36.0  
65 192,358 40.1 64,125 40.1 128,233 40.1  
Low income        < 0.001
 yes 11,251 2.3 6441 4.0 4810 1.5  
 no 468,716 97.7 153,548 96.0 315,168 98.5  
Catastrophic illness        < 0.001
 yes 113,150 23.6 49,914 31.2 63,236 19.8  
 no 366,817 76.4 110,075 68.8 256,742 80.2  
Urbanization        < 0.001
 high 150,124 31.3 41,562 26.0 108,562 33.9  
 medium 205,154 42.7 65,049 40.7 140,105 43.8  
 low 124,689 26.0 53,378 33.4 71,311 22.3  
CCI 2.36 ± 3.82 2.97 ± 4.10 2.06 ± 3.63   < 0.001
Drug dependence        < 0.001
 yes 2051 0.4 1597 1.0 454 0.1  
 no 477,916 99.6 158,392 99.0 319,524 99.9  
Alcohol dependence        < 0.001
 yes 7846 1.6 5674 3.5 2172 0.7  
 no 472,121 98.4 154,315 96.5 317,806 99.3  
Mental disorders        < 0.001
 yes 76,322 15.9 53,537 33.5 22,785 7.1  
 no 403,645 84.1 106,452 66.5 297,193 92.9  
  1. P-value (category variable: Chi-square/Fisher exact test; continue variable: t-test)