Survey characteristics of Natsal-2, Natsal-3 and FECOND
| Survey characteristic | Natsal-2 | Natsal-3 | FECOND |
| Study design | Nationally representative probability survey | ||
| Women aged 17–45 years (n) | 6781 | 5608 | 4173 |
| Survey mode | Face-to-face interview, CASI for sensitive questions | Telephone interview | |
| Survey mode for abortion questions | CASI | Telephone interview | |
| Data collection for abortions | Direct question | Pregnancy history | |
| Country | Britain | France | |
CASI, computer-assisted self-administered interview; FECOND, French Fertility, Contraception and Sexual Dysfunction Survey; Natsal, National Survey of Sexual Attitudes and Lifestyles.