Table 4

Odds ratios and confidence intervals from logistic regression analyses predicting the effects of various characteristics on the likelihood of repeat abortion among women who have had prior experience of abortion

Characteristic	n	OR	p	95% CI
Age at time of interview	1003	0.96	^*	0.92–1.00
Index of multiple deprivation
First quintile (least deprived)	167	0.51	^*	0.26–1.00
Second quintile	212	0.80		0.45–1.42
Third quintile	200	0.36	^**	0.18–0.70
Fourth quintile	210	0.68		0.38–1.22
Fifth quintile (most deprived) [ref]	209	1.00
Age at first sexual experience	998	0.87	^**	0.80–0.95
Ethnicity
White [ref]	900	1.00
Black	46	3.76	^**	1.61–8.80
Indian	16	1.27		0.22–7.28
Pakistani and Bangladeshi	5	4.19		0.39–44.5
Chinese, other Asian and Other	36	2.80	^*	1.15–6.82
Number of natural children	1003	1.33	^**
Education
Left school at 16 with no qualifications	161	2.61	^**	1.37–4.99
Left school at 16 with some qualifications	309	2.36	^***	1.46–3.81
Left school at 17+ [ref]	529	1.00
Housing tenure
Own outright/with mortgage or loan [ref]	598	1.00
Rented accommodation	402	1.96	^**	1.27–3.03
Contraceptive use at first intercourse
Condom (+ other modern method) [ref]	470	1.00
Other reliable	122	0.76		0.38–1.56
Non-reliable (withdrawal/rhythm)	86	1.96	^*	1.00–3.87
Non–use	314	2.04	^**	1.25–3.32
Number of sexual partners
≤4 [ref]	289	1.00
≥5	701	2.13	^**	1.25–3.63
Birth prior to first abortion
No [ref]	693	1.00
Yes	291	0.12	^***	0.07–0.22
Age at last abortion (years)
<16	46	0.01	^**	0.00–0.18
16–17	139	0.12	^***	0.05–0.30
18–19	153	0.22	^***	0.10–0.50
20–24 [ref]	282	1.00
25–29	207	2.49	^**	1.46–4.25
30–34	108	6.20	^***	3.12–12.3
35–39	63	7.53	^***	3.18–17.8
Constant		1.45
–2 log likelihood		643.29
df		26

* p<0.05,
** p<0.01,
*** p<0.001.
CI, confidence interval; df, degrees of freedom; OR, odds ratio; ref, reference category.