Table 2.

Multivariable analysis. Logistic regression taking the dichotomous Athens score variable (presence vs absence of insomnia) as the dependent variable

	p-value	ORa	Confidence interval
			Lower bound	Lower bound
Death in the family last year (yes vs no*)	0.001	1.741	1.252	2.422
Stressful situations (divorce/unemployment) (yes vs no*)	<0.001	2.292	1.594	3.295
Caffeine before sleep**	0.008
Caffeine before sleep less than once a month	0.037	2.073	1.046	4.109
Caffeine before sleep at least once a month	0.776	0.880	0.365	2.124
Caffeine before sleep at least once a week	0.001	2.964	1.524	5.767
Caffeine before sleep every day	0.349	1.226	0.800	1.877
Exercise (yes vs no*)	0.047	0.675	0.459	0.995
Eat heavy before sleep**	0.069
Eat heavy before sleep <2 days weekly	0.087	1.390	0.953	2.026
Eat heavy before sleep 2–6 days per week	0.020	2.020	1.117	3.654
Eat heavy before sleep daily	0.912	1.053	0.419	2.650
Stress score (BDS-22)	<0.001	1.044	1.023	1.064
Depression score (HAM-D)	<0.001	1.107	1.069	1.146
Anxiety score (GAD)	0.011	1.056	1.013	1.100
Body mass index	0.024	1.046	1.006	1.088
Number of medications taken per day	0.098	1.124	0.979	1.291

^*Reference group.

^**Compared to no caffeine drinking or no heavy eating before sleep. Variables entered: family monthly income, family insomnia problems, death in the family last year, verbal assault, stressful situations (divorce/unemployment), alcohol intake frequency, coffee intake frequency, exercise, family history of psychiatric disorders, chronic pain, psychiatric diseases, caffeine before sleep, eat heavy food before sleep, number of chronic diseases, medications, BDS-22, HAM-D, GAD, body mass index, number of medications taken daily.

BDS, Beirut Distress Scale; GAD, Generalized Anxiety Disorder Scale; HAM-D, Hamilton depression.