Table 4.

Age-adjusted ORs of sociodemographic and sexual behaviour/attitudinal characteristics for each type of sexual inactivity versus being sexually active

	Men			Women
	Sexually inexperienced	In a relationship	Single	Sexually inexperienced	In a relationship	Single
Religion	OR (95% CI)	OR (95% CI)	OR (95% CI)	OR (95% CI)	OR (95% CI)	OR (95% CI)
None	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Christian	1.67 (1.26 to 2.22)	1.29 (0.94 to 1.77)	0.90 (0.72 to 1.12)	2.06 (1.61 to 2.65)	0.71 (0.54 to 0.93)	0.83 (0.70 to 0.98)
Other religion	4.65 (3.27 to 6.61)	1.37 (0.64 to 2.92)	1.21 (0.78 to 1.89)	8.77 (6.11 to 12.57)	0.96 (0.47 to 1.95)	1.15 (0.78 to 1.72)
P value	<0.001	0.119	0.970	<0.001	0.076	0.345
Ethnicity
White	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Other	2.94 (2.19 to 3.94)	1.15 (0.64 to 2.06)	0.64 (0.43 to 0.95)	4.43 (3.37 to 5.83)	1.06 (0.60 to 1.85)	1.76 (1.34 to 2.32)
P value	<0.001	0.633	0.028	<0.001	0.850	<0.001
Education
No academic qualification	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Academic qualifications typically gained at age 16 years	0.20 (0.12 to 0.35)	1.19 (0.79 to 1.78)	0.46 (0.35 to 0.62)	0.33 (0.16 to 0.68)	0.83 (0.62 to 1.12)	0.83 (0.67 to 1.02)
Studying for/attained further academic qualification	0.69 (0.45 to 1.06)	1.08 (0.73 to 1.58)	0.53 (0.41 to 0.69)	1.61 (1.00 to 2.59)	1.11 (0.81 to 1.52)	0.76 (0.61 to 0.95)
P value	0.163	0.735	<0.001	<0.001	0.568	0.015
National Statistics Socio-Economic Classification26
Managerial & professional occupations	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Intermediate occupations	1.67 (0.85 to 3.26)	0.98 (0.64 to 1.52)	0.97 (0.69 to 1.37)	0.75 (0.39 to 1.43)	1.00 (0.70 to 1.42)	1.13 (0.89 to 1.42)
Semiroutine/routine occupations	1.89 (1.02 to 3.51)	1.34 (0.94 to 1.92)	1.77 (1.34 to 2.34)	1.08 (0.63 to 1.86)	1.05 (0.75 to 1.48)	1.44 (1.16 to 1.80)
Never worked and long-term unemployed	15.66 (8.33 to 29.42)	1.52 (0.95 to 2.44)	5.04 (3.57 to 7.13)	3.71 (2.01 to 6.85)	1.56 (1.12 to 2.18)	1.82 (1.44 to 2.31)
Student in full-time education	15.48 (8.58 to 27.93)	2.13 (0.49 to 9.22)	2.11 (1.27 to 3.49)	9.07 (5.27 to 15.59)	0.90 (0.29 to 2.73)	2.26 (1.42 to 3.59)
P value	<0.001	0.027	<0.001	<0.001	0.017	<0.001
Quintile of Index of Multiple Deprivation27
1 (least deprived)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
2	1.06 (0.72 to 1.56)	1.16 (0.76 to 1.78)	1.21 (0.82 to 1.78)	0.79 (0.55 to 1.15)	1.09 (0.78 to 1.53)	1.47 (1.13 to 1.93)
3	0.97 (0.66 to 1.43)	0.92 (0.59 to 1.44)	1.68 (1.19 to 2.39)	1.36 (0.96 to 1.92)	1.11 (0.76 to 1.62)	1.96 (1.51 to 2.55)
4	1.23 (0.85 to 1.78)	0.86 (0.53 to 1.39)	2.00 (1.39 to 2.87)	1.22 (0.86 to 1.73)	1.16 (0.78 to 1.72)	2.59 (2.01 to 3.35)
5 (most deprived)	1.27 (0.87 to 1.84)	0.75 (0.44 to 1.27)	2.80 (1.98 to 3.94)	1.15 (0.80 to 1.65)	1.35 (0.91 to 2.00)	2.96 (2.26 to 3.86)
P value	0.140	0.141	<0.001	0.111	0.159	<0.001
Body mass index (kg/m2)
<25	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
25 to <30	0.56 (0.39 to 0.80)	1.36 (0.94 to 1.98)	0.70 (0.55 to 0.88)	0.68 (0.48 to 0.95)	1.20 (0.90 to 1.59)	1.00 (0.82 to 1.23)
30 or higher	0.87 (0.54 to 1.40)	1.96 (1.30 to 2.96)	0.92 (0.69 to 1.21)	1.11 (0.77 to 1.59)	1.81 (1.33 to 2.46)	1.71 (1.38 to 2.11)
P value	0.099	0.001	0.281	0.644	<0.001	<0.001
Height
Below average (men<177 cm; women<164 cm)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Average or above (men≥177 cm; women≥164 cm)	0.67 (0.52 to 0.86)	0.85 (0.63 to 1.15)	0.80 (0.65 to 1.00)	0.68 (0.54 to 0.85)	0.82 (0.64 to 1.05)	0.81 (0.69 to 0.95)
P value	0.002	0.288	0.046	0.001	0.116	0.011
Have felt sexual attraction
Yes	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
No	456.8 (38.2 to 5456.9)	2.13 (0.31 to 14.7)	1.58 (0.14 to 18.0)	186.9 (44.9 to 778.4)	1.29 (0.26 to 6.72)	6.5 (2.6 to 16.4)
P value	<0.001	0.441	0.709	<0.001	0.763	<0.001
Sexual identity
Heterosexual	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Other	1.55 (0.66 to 3.65)	0.47 (0.10 to 2.17)	2.00 (1.25 to 3.19)	0.73 (0.35 to 1.53)	4.53 (2.36 to 8.71)	1.75 (1.09 to 2.83)
P value	0.314	0.331	0.004	0.409	<0.001	0.022
Masturbated in past 7 days
No	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Yes	0.52 (0.38 to 0.70)	0.83 (0.58 to 1.18)	1.16 (0.94 to 1.43)	0.43 (0.26 to 0.72)	0.56 (0.34 to 0.92)	0.81 (0.63 to 1.03)
P value	<0.001	0.291	0.177	0.001	0.024	0.087
Lifetime sexual partners
0	–	–	–	–	–	–
1	–	1.00 (ref)	1.00 (ref)	–	1.00 (ref)	1.00 (ref)
2 to 4	–	0.77 (0.49 to 1.21)	1.23 (0.89 to 1.70)	–	0.76 (0.57 to 1.02)	1.27 (1.00 to 1.61)
5 or more	–	0.63 (0.42 to 0.94)	0.70 (0.51 to 0.96)	–	0.72 (0.52 to 0.98)	1.20 (0.94 to 1.51)
P value		0.023	<0.001		0.034	0.180
Ever paid for sex
No	–	1.00 (ref)	1.00 (ref)	–	1.00 (ref)	1.00 (ref)
Yes	–	1.07 (0.66 to 1.72)	1.24 (0.92 to 1.68)	–	3.50 (0.82 to 15.01)	0.86 (0.07 to 10.03)
P value		0.788	0.158		0.092	0.904
Denominators*
Unweighted, n	406	235	516	441	431	1048
Weighted, n	304	384	467	268	558	820

ORs are for each of the categories of sexual inactivity versus being sexually active. Logistic regression was performed separately for each type of sexual inactivity and variable and adjusted for age as a continuous variable.

*All participants (denominators vary across variables because of item non-response)