Table 2.

Model Statistic for Pittsburgh Sleep Quality Index (PSQI) Global Score Associated with Suicidal Ideation (N=1,054)

PSQI global score	PHQ-9 Suicidal Ideation				Unadjusted a OR (95% CI)	Adjusted b OR (95% CI)	Adjusted c OR (95% CI)
	No (N = 829)		Yes (N = 261)
	n	%	n	%
Overall sleep quality
Good (PSQI global score ≤ 5)	386	48.4	33	12.9	Reference	Reference	Reference
Poor (PSQI global score > 5)	412	51.6	223	87.1	6.33 (4.28–9.36)	6.30 (4.23–9.37)	3.59 (2.34–5.51)
PSQI global score
Lowest tertile (0–5)	386	48.4	33	12.9	Reference	Reference	Reference
Middle tertile (6–8)	227	28.5	74	28.9	3.81 (2.45–5.95)	3.81 (2.43–5.98)	2.47 (1.71–4.41)
Highest tertile (≥ 9)	185	23.2	149	58.2	9.42 (6.21–14.28)	9.41 (6.14–14.40)	4.66 (2.93–7.41)
P-value for trend					< 0.0001	< 0.0001	< 0.0001
PSQI global score (continuous) d	6.1 ± 3.4		9.3 ± 3.4		1.32 (1.24–1.36)	1.30 (1.24–1.37)	1.20 (1.14–1.27)

Abbreviations: OR, odds ratio; CI, confidence interval

^aUnadjusted model

^bAdjusted for age (years), sex, education, cigarette smoking, alcohol and khat consumption

^cFurther adjusted for depression status (yes [PHQ-8 ≥ 10] vs. no [PHQ-8 < 10])

^dMean ± SD (standard deviation)