Table 1. Numbers and proportions of women hrHPV+ve and adjusted multivariate ORs for socio-demographic and lifestyle factors.

	Total (n)	hr HPV+ve (n)	% hrHPV+ve	Multivariate ORa	95% CI
Overall	5038	1973	39.2
Tertiary education/training
No degree	4122	1656	40.2	1	Reference
Degree	887	305	34.4	0.72	0.61–0.87
Missing	29	12	41.4
				Global χ12=12.85, P=0.0003
Ethnicity
White	4787	1868	39.0	1	Reference
Other (non-white)	223	95	42.6	1.42	1.03–1.94
Missing	28	10	35.7
				Global χ12=4.68, P=0.0306
Marital status
Married/living as married	2824	840	29.8	1	Reference
Divorced/separated/widowed	667	289	43.3	1.97	1.62–2.40
Single	1494	826	55.3	1.29	1.09–1.53
Missing	53	18	34.0
				Global χ22=47.80, P<0.0001
Ever pregnantb
No	1589	855	53.8	1	Reference
Yes	3412	1104	32.4	0.75	0.63–0.89
Missing	37	14	37.8
				Global χ12=11.30, P=0.0008
Age at first pregnancyb
Never pregnant	1589	855	53.8	1	Reference
First pregnancy aged <20 years	1080	453	41.9	0.86	0.71–1.05
First pregnancy aged over 20 years	2303	640	27.8	0.67	0.55–0.80
Missing	66	25	37.9
				Global χ22=19.76, P=0.0001
Childrenb
No	2113	1096	51.9	1	Reference
Yes	2869	854	29.8	0.71	0.60–0.83
Missing	56	23	41.1
				Global χ12=17.06, P<0.0001
Number of childrenb,c
1	793	324	40.9	1	Reference
2	1170	288	24.6	0.75	0.59–0.95
3	563	148	26.3	0.89	0.67–1.19
4	190	49	25.8	0.82	0.54–1.24
5–8	86	25	29.1	1.11	0.64–1.94
Missing	67	20	29.9
				Global χ42=7.23, P=0.1242
Caesarean everb,c
No	2367	704	29.7	1	Reference
Yes	481	145	30.2	1.12	0.88–1.43
Missing	21	5	23.8
				Global χ12=0.85, P=0.3574
Reproductive historyd
Never pregnant	1589	855	53.8	1	Reference
First pregnancy <age 20 years, have children	867	335	38.6	0.79	0.64–0.99
First pregnancy <age 20 years, no children	205	113	55.1	1.01	0.73–1.40
First pregnancy ⩾age 20 years, have children	1981	513	25.9	0.61	0.50–0.75
First pregnancy ⩾age 20 years, no children	313	125	39.9	0.83	0.62–1.10
Missing	83	32	38.6
				Global χ42=25.55, P<0.0001
Current barrier contraception
No	4211	1611	38.3	1	Reference
Yes	811	354	43.7	1.05	0.87–1.27
Missing	16	8	50.0
				Global χ12=0.29, P=0.5907
Hormonal contraceptione
Never pill user/no other current hormonal contraception	2416	649	26.9	1	Reference
Never pill user/currently use other hormonal contraception	200	101	50.5	1.58	1.13–2.21
Ex-pill user/no other current hormonal contraception	551	256	46.5	1.33	1.06–1.66
Ex-pill user/currently use other hormonal contraception	98	48	49.0	1.12	0.71–1.76
Current pill	1694	889	52.5	1.54	1.30–1.84
Missing	79	30	38.0
				Global χ42=27.33, P<0.0001
Physical activityf
Never	720	275	38.2	1	Reference
Ever	4239	1665	39.3	0.86	0.71–1.04
Missing	79	33	41.8
				Global χ12=2.40, P=0.1216
Smoking status
Never smoker	2340	862	36.8	1	Reference
Ex-smoker	851	264	31.0	0.88	0.73–1.07
Current smoker	1798	822	45.7	1.21	1.04–1.40
Missing	49	25	51.0
				Global χ22=11.83, P=0.0027

Abbreviations: CI, confidence interval; hrHPV+ve, hrHPV positive; OR, odds ratio.

^aMultivariate OR adjusted for age/smear, tertiary education/training, ethnicity, marital status, reproductive history, use of hormonal contraception and smoking status.

^bMultivariate OR adjusted for age/smear, tertiary education/training, ethnicity, marital status, use of hormonal contraception and smoking status.

^cRestricted to women who have had children.

^dEver been pregnant, age at first pregnancy and ever had children were all individually associated with hrHPV. As these variables are related, a composite variable was created and fitted in model.

^eWomen were classified into one of five categories on the basis of current use of oral contraceptive pill or other hormonal contraception, and on any previous oral contraceptive pill use.

^fThere was no effect on risk of hrHPV of physical activity (never/ever) or of frequency of physical activity (data not shown).