Table 1

Association between various variables (demographic variables, infant’s characteristics, SIDS risk variables, behavioural characteristics) and ALTE

Variables	Controls (%)	Overall ALTE (%)	p value	RR	Idiopathic ALTE (%)	p value	RR	SIDS (%)
Once the multiple comparisons were accounted for, a p value <0.00357 (marked in bold) should be considered statistically significant (Bonferroni adjustment).
RR, relative risk.
Risk factors for SIDS in the Tyrol (1993–2001): *p<0.05, †p<0.10.
‡Maternal educational level is available in a subgroup.
Demographic variables and SIDS risk attributes
Male sex	50.9	45.0	0.166	0.79	40.4	0.113	0.65	50.0
Previous pregnancies ⩾2	23.9	25.3	0.768	1.08	31.6	0.176	1.47	27.3
Educational level ⩾12 years‡	30.0	20.0	0.144	0.67	33.3	0.856	1.11	15.2
Single parenthood	9.6	23.8	<0.001	2.93	16.4	0.089	1.84	9.5
Mother’s age <23 years†	11.2	15.0	0.149	1.40	14.0	0.490	1.30	22.7
Low birth weight†	5.0	10.1	0.006	2.13	5.3	0.906	1.10	13.6
Family history infant death*	6.1	14.4	<0.001	2.59	12.5	0.044	2.21	18.2
Low gestational age*	7.4	13.0	0.018	1.86	6.0	0.702	0.80	19.0
Smoking during pregnancy*	15.2	27.1	<0.001	2.02	21.2	0.218	1.49	42.1
Prone sleeping position*	4.7	8.6	0.028	1.92	10.7	0.033	2.44	38.1
No breast feeding*	10.5	14.9	0.092	1.50	9.1	0.740	0.86	55.0
Profuse night sweating*	11.2	22.9	<0.001	2.33	17.5	0.131	1.68	35.0
Behavioural characteristics
Repeated apnoea episodes	1.6	23.5	<0.001	18.18	22.8	<0.001	18.02	5.9
Remarkably pallid	4.0	15.4	<0.001	4.30	14.3	<0.001	2.95	–
Cyanotic episodes	2.6	18.5	<0.001	8.42	17.5	<0.001	7.97	0.0
Feeding difficulties	20.3	50.7	<0.001	4.01	50.9	<0.001	4.05	10.5