Table 1.

Respondents’ demographic characteristics.

		n	%
Relationship status	Heterosexual couple	416	91.0
	Same-sex couple	18	3.9
	Single	21	4.6
	Treatment with non-partner	2	0.4
	Total	457	100
Respondents’ age (years) Range: 21–55 Mean: 34.6 SD: 4.9	≤35	232	50.8
	36–37	97	21.2
	38–39	57	12.5
	40–42	49	10.7
	43–44	11	2.4
	≥45	11	2.4
	Total	457	100
Partners’ age (years) Range: 24–59 Mean 36.4 SD 5.8	≤35	171	39.7
	36–37	99	23
	38–39	54	12.5
	40–42	54	12.5
	43–44	20	4.6
	≥45	33	7.7
	Total	431	100
Residence	London	123	26.9
	South East England	96	21.0
	South West England	41	9.0
	East Midlands	26	5.7
	West Midlands	20	4.4
	North East England	13	2.8
	North West England	42	9.2
	Yorkshire and the Humber	21	4.6
	Scotland	38	8.3
	Wales	24	5.3
	Northern Ireland	13	2.4
	Total	457	100
Ethnicity	White	414	90.6
	Mixed/multiple ethnicities	18	3.9
	Asian/Asian British	18	3.9
	Black/African/Caribbean/Black British	1	0.2
	Other ethnic group	5	1.1
	I prefer not to say	1	0.2
	Total	457	100

SD, standard deviation.