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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.