Table 2

Subgroup (1): comparison of last observed weight and change in z score (δzw) from birth for SIDS and control infants and within different birth centile groups

	SIDS
	Mean	SD	n	Mean	SD	n	OR (95% CI)2-150	p value
Last weight
Regardless of birth weight	−0.412-151	1.24	247	+0.212-152	1.07	1110	1.84 (1.56–2.16)	<0.0001
Birth weight <16th centile	−0.99	1.18	54	−0.79	1.00	146	1.23 (0.62–2.45)	0.56
Birth weight >15th centile	−0.25	1.21	193	+0.36	1.00	964	1.83 (1.52–2.22)	<0.0001
Change in z score (δzw)
Regardless of birth weight	−0.38	1.40	247	+0.22	1.10	1110	1.64 (1.42–1.89)	<0.0001
Birth weight <16th centile	−0.06	1.40	54	+0.04	1.06	146	1.09 (0.61–1.95)	0.76
Birth weight >15th centile	−0.47	1.39	193	+0.24	1.10	964	1.75 (1.48–2.07)	<0.0001

↵2-150 Adjusted for infant age (including time of this observation) and the total number of observations.
↵2-151 Equivalent centile: 34th.
↵2-152 Equivalent centile: 58th.