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Table 4 The PSQI total score between smokers and nonsmokers, drinkers and nondrinkers among drug users and non users

From: Sleeping problems in Chinese illicit drug dependent subjects

Variables PSQI total score
n M ± SD p
Non users Smoking Yes 895 4.38 ± 2.583 0.004
No 1328 4.07 ± 2.378
Alcohol drinking Yes 686 4.57 ± 2.463 <0.001
No 1535 4.03 ± 2.449
Drug users Smoking Yes 2104 7.94 ± 4.427 0.01
No 71 8.94 ± 3.112
Alcohol drinking Yes 758 6.99 ± 5.027 <0.001
No 1413 8.51 ± 3.916
  1. n: number; M: mean; SD: standard deviation.