Table 1 Sociodemographic characteristics, sexual and HIV testing histories of the INSIGHT case-control study participants

	Cases n = 75		Controls n = 157

Categorical variables	%		%
Ethnicity
White	96		91
Non-white	4		9
Country of birth
UK	65		61
Outside UK	35		39
Education: years since aged 16
Left school with no qualifications	19		12
Up to 2 years	23		17
More than 3 years	55		65
Educated to degree level	47		54
Employment
Employed (full or part time)	77		77
Unemployed	9		8
Student	5		8
Sexuality
Describes themselves as gay	77		76
Completely or open to most about sexuality	91		85
Continuous variables	mean	range	mean	range
Age at second last HIV test	34.3	18–56	34.2	19–66
Months between last 2 HIV tests	10.6	3–24	10.5	3–24
Age at last HIV test	35.2	20–58	35.1	20–66
Sexual and HIV testing history
Years since first anal sex	16	1–40	14	1–48
Years since first visit to STI clinic	10	0–38	9	0–37
Years since first ever HIV test	7	0–21	7	0–21
Lifetime number of HIV tests	6	2–20	7	2–55