Table 2

Adjusted odds ratios for sudden infant death syndrome (SIDS) compared with sudden intrauterine unexplained death (SIUD) in general, with growth restricted fetus low for optimal weight (SIUD^IUGR), or normal weight fetus (SIUD^{not IUGR}) by selected variables

Variable	SIUD v controls OR adj (95% CI)	SIDS v controls OR adj (95% CI)	SIUD v SIDS OR adj (95% CI)	SIUD^IUGRv SIDS OR adj (95% CI)	SIUD^{not IUGR}v SIDS OR adj (95% CI)
NS, Not significant; Ref, reference value.
Body mass index
< 25 kg/m²	Ref	Ref	Ref	Ref	Ref
≥ 25 kg/m²	3.14 (1.24 to 7.97)	Excluded as NS	7.45 (1.49 to 37.3)	Excluded as NS	21.7 (2.25 to 208)
Smoking
No smoking	Ref	Ref	Ref	Ref	Ref
< 10 cig/day	NS	1.93 (0.83 to 4.50)	NS	Excluded as NS	0.04 (<0.01 to 1.07)
≥ 10 cig/day	3.04 (1.13 to 8.19)	8.96 (3.94 to 20.4)	0.22 (0.06 to 0.83)		0.12 (0.02 to 0.84)
Age (linear regression)
Risk/year	1.11 (1.04 to 1.20)	0.85 (0.78 to 0.92)	1.39 (1.17 to 1.66)	1.37 (1.17 to 1.62)	1.49 (1.15 to 1.92)
Proteinuria
No	Ref	Ref	Ref	Ref	Ref
Yes	Excluded as NS	3.51 (1.56 to 7.88)	Excluded as NS	0.14 (0.02 to 0.89)	Excluded as NS
Fundal height abnormality
No	Ref	Ref	Ref	Ref	Ref
Low	Excluded as NS	NS	13.8 (1.56 to 122)	7.82 (1.42 to 43.2)	Excluded as NS
High		2.05 (1.03 to 4.09)	NS	NS
Primiparity
Yes	Ref	Ref	Ref	Ref	Ref
No	Excluded as NS	8.78 (3.84 to 20.1)	0.03 (<0.01 to 0.17)	0.04 (0.01 to 0.21)	<0.01 (<0.01 to 0.16)
Sex
Female	Ref	Ref	Ref	Ref	Ref
Male	Excluded as NS	2.17 (1.10 to 4.28)	0.22 (0.07-0.78)	0.24 (0.07 to 0.84)	0.13 (0.02 to 0.82)
Education
< 10 years	2.89 (1.25 to 6.68)	Excluded as NS	Excluded as NS	Excluded as NS	Excluded as NS
10 years +	Ref	Ref	Ref	Ref	Ref