| Not using condom (%) | Crude OR (95% CI) | Adjusted OR (95% CI) | |
| Age group (years) | |||
| <30 | 1.8 | 1 | |
| ⩾30 | 7.4 | 4.5 (1.7 to 11.7) | 3.4 (1.2 to 9.6) |
| Marital status (last 12 months) | |||
| Cohabiting and never married | 3.3 | 1 | |
| Married and previously married | 8.2 | 2.7 (1.2 to 5.9) | 1.4 (0.6 to 3.4) |
| Level of education | |||
| University and secondary | 3.5 | 1 | |
| < Secondary | 6.7 | 2.0 (0.9 to 4.6) | 1.5 (0.6 to 3.5) |
| Country of birth | |||
| Spain | 4.5 | 1 | |
| Other country | 9.9 | 2.3 (0.8 to 7.0) | 1.3 (0.5 to 3.7) |
| Size of municipality | |||
| >50 000 inhabitants | 4 | 1 | |
| ⩽50 000 inhabitants | 6.1 | 1.6 (0.7 to 3.5) | 1.4 (0.6 to 3.2) |
| Religion | |||
| Non-practicing member of a religious group, no religion and no answer | 4.2 | 1 | |
| Practicing member of a religious group | 12.3 | 3.2 (1.1 to 8.9) | 2.6 (0.9 to 7.5) |
| Communication with parents about sex | |||
| Satisfactory | 3.7 | 1 | |
| Unsatisfactory and lack of communication | 5.7 | 1.6 (0.7 to 3.8) | 1.6 (0.6 to 4.1) |
| Age at first sexual intercourse | |||
| ⩾16 years | 4.3 | 1 | |
| <16 years | 7.7 | 1.9 (0.8 to 4.4) | 2.6 (1.1 to 6.4) |
Base: unweighted 687; weighted 733.