Demographic and behavioural characteristics of participants
| Characteristic | % | n* |
| Median age (IQR), years | 34.5 | 25.7–41.1 |
| Gender and sexual behaviour | ||
| Female | 10.0 | 20 |
| Men who have sex with men | 49.5 | 98 |
| Men who have sex exclusively with women | 40.5 | 80 |
| Self-reported ethnicity | ||
| White | 74.0 | 142 |
| Black | 18.3 | 16 |
| Asian | 5.2 | 10 |
| Other | 12.5 | 24 |
| Highest qualification | ||
| Higher degree | 31.8 | 63 |
| Degree | 38.4 | 76 |
| Further education | 18.7 | 37 |
| Secondary school | 10.6 | 21 |
| None | 0.5 | 1 |
| Place of birth | ||
| Outside UK | 53.5 | 107 |
| UK | 46.5 | 93 |
| English first language | ||
| No | 32.0 | 63 |
| Yes | 68.0 | 136 |
| Ever purchased from the internet | ||
| No | 1.5 | 3 |
| Yes | 98.5 | 195 |
*The numbers in categories may not add up to 200 due to missing data items.