Maternal and perinatal factors associated with hospitalised infectious mononucleosis in children, adolescents and young adults: record linkage study

Table 4 Associations between characteristics of the births and IM in the child

	Number and % of each group of children							Chi sq (df) with p value below
		IM all ages		IM 11+		No IM		All IM (vs no IM)	IM aged 11+ (vs no IM)
		No.	%	No.	%	No.	%
No. of babies delivered	1	223	99.1	156	100	243046	97.8	1.7(1)	3.5(1)
	2+	2	0.9	0	0	5388	2.2	0.2	0.06
Birth weight (g)	1000-2999	61	27.2	44	28.4	58492	23.6	1.7(2)	2.5(2)
	3000-3999	144	64.3	96	61.9	168005	67.9	0.4	0.3
	4000-5499	19	8.5	15	9.7	21132	8.5
Gestational age	24-37w	19	9	11	7.4	21893	10.1	0.7(2)	2.2(2)
	38-41w	170	80.2	119	80.4	173698	80.4	0.7	0.3
	42-47w	23	10.9	18	12.2	20544	9.5
Breastfeeding	no	31	25.6	21	27.6	50935	30.3	1.2(1)	0.3(1)
	yes	90	74.4	55	72.4	117274	69.7	0.3	0.6
Caesarian birth	no	209	92.9	147	94.2	223584	92.6	0(1)	0.6(1)
	yes	16	7.1	9	5.8	18009	7.5	0.8	0.4
Forceps	no	182	80.9	126	80.8	209918	86.9	7.1*(1)	5.1*(1)
	yes	43	19.1	30	19.2	31675	13.1	0.008	0.02
Presentation	vertex	112	93.3	72	96	158190	95	0.7(1)	0.2(1)
	other	8	6.7	3	4	8303	5	0.4	0.7
Apgar 1 score	1 to 5	19	9.6	15	10.6	21337	9.5	2.1(2)	2(2)
	6 to 8	65	33	47	33.1	64404	28.5	0.4	0.4
	9 to 10	113	57.4	80	56.3	140154	62
Apgar 5 score	1 to 5	0	0	0	0	884	0.6	0.6(2)	0.4(2)
	6 to 8	3	3	2	2.9	4226	2.8	0.7	0.8
	9 to 10	97	97	66	97.1	148738	96.7
Gender	male	113	50.2	74	47.4	127716	51.4	0.1(1)	1(1)
	female	112	49.8	82	52.6	120711	48.6	0.7	0.3
Pre-eclampsia	no	195	86.7	133	85.3	224165	90.3	3.3(1)	4.4*(1)
	yes	30	13.3	23	14.7	24220	9.8	0.07	0.04

ISSN: 1471-2334