Table 3

Relation between infant bed-sharing on a specific night and demographic characteristics

	Neonatal infants						Infants aged 3–4 months
	Bed-shared*		Not bed-shared		χ²†	p value	Bed-shared*		Not bed-shared		χ²†	p value
	n/N	%	n/N	%	χ²†	p value	n/N	%	n/N	%	χ²†	p value
*For part or whole sleep on a specific night.
†Using Yates’s corrected value.
‡Fisher’s exact test.
§Including child in the study.
¶Based on the Registrar General’s Occupational Coding using highest parental classification (I = professional to U = unemployed).
Infant factors
Sex (boys)	45/84	54	118/227	52	0.01 (1df)	0.90	46/74	62	170/350	49	3.99 (1df)	0.046
Multiple birth	3/84	4	1/227	0.4	–	0.06‡	1/73	1	3/348	0.9	–	0.53‡
Birth weight <2.5 kg	2/82	2	9/212	4	–	0.73‡	4/73	5	9/334	3	–	0.26‡
Gestation <37 weeks	5/80	6	10/211	5	–	0.57‡	2/72	3	19/335	6	–	0.55‡
Attempted to breast feed	73/84	87	113/227	50	33.6 (1df)	<0.0001	58/74	78	202/350	58	3.17 (1df)	0.08

Family factors
Maternal
Age <21 y	7/84	8	29/225	13	0.83 (1df)	0.36	9/73	12	38/350	11	0.03 (1df)	0.87
Marital status (single)	4/84	5	22/225	10	1.40 (1df)	0.24	5/73	7	27/350	8	0.00 (1df)	0.99
Ethnicity (non-white)	6/83	7	10/225	4	–	0.39‡	3/73	4	17/348	5	–	1.00‡
Parity >3§	2/84	2	15/226	7	–	0.17‡	3/73	4	24/350	7	–	0.60‡
S.e.c. status¶
I/II	38/81	47	74/217	34	4.34 (2df)	0.11	29/71	41	124/342	36	6.21 (2df)	0.04
IIIm/n	25/81	31	89/217	41			32/71	45	122/342	36
IV/V/U	18/81	22	54/217	25			10/71	14	96/342	28
No waged income	8/82	10	18/220	8	0.04 (1df)	0.84	4/72	6	44/345	13	2.36 (1df)	0.12