Table 1.

The observed association of smoking behaviour on suicidal ideation and suicide attempts controlling for age, gender and socioeconomic position

	Suicidal ideation (yes/no)			Suicide attempt (yes/no)
Smoking	N	Odds ratio (95% CI)	P-value	N	Odds ratio (95% CI)	P-value
Ever versus never	109 301	1.39 (1.31–1.48)	<0.001	109 688	2.07 (1.91–2.26)	<0.001
Current versus former	45 825	1.54 (1.39–1.70)	<0.001	46 011	1.54 (1.36–1.75)	<0.001
Cigarettes per day	29 230	1.02 (1.01–1.02)	<0.001	29 342	1.02 (1.02–1.03)	<0.001
Lifetime smoking	109 301	1.42 (1.36–1.48)	<0.001	109 688	1.80 (1.71–1.89)	<0.001