Table 1. Characteristics (number and percentage) of the pregnant women who submitted pet ownership and activity information (n = 11,466).
| Variable | Level | Number | Valid percent |
| Maternal education | CSE or no qualification (lowest) | 2056 | 19.1 |
| Vocational | 1061 | 9.9 | |
| O level | 3781 | 35.1 | |
| A level | 2472 | 23.0 | |
| Degree (highest) | 1395 | 13.0 | |
| Missing | 701 | ||
| Maternal social class | Professional (highest) | 535 | 5.9 |
| Managerial and technical | 2845 | 31.5 | |
| Skilled: non-manual | 3911 | 43.2 | |
| Skilled: manual | 706 | 7.8 | |
| Partly skilled | 858 | 9.5 | |
| Unskilled (lowest) | 190 | 2.1 | |
| Missing | 2421 | ||
| Mother worked during pregnancy | No | 3061 | 29.9 |
| Yes | 7166 | 70.1 | |
| Missing | 1239 | ||
| Maternal age at delivery | <21 years | 671 | 5.9 |
| 21–30 years | 7202 | 63.0 | |
| >30 years | 3560 | 31.1 | |
| Missing | 33 | ||
| Number of people in household | 2 | 4426 | 38.8 |
| 3 | 4189 | 36.7 | |
| 4 | 1867 | 16.4 | |
| 5+ | 935 | 8.2 | |
| Missing | 49 | ||
| Has previous living children | No | 4913 | 43.7 |
| Yes | 6333 | 56.3 | |
| Missing | 220 | ||
| House type | Detached | 1668 | 14.7 |
| Semi-detached | 3985 | 35.1 | |
| Terraced | 3686 | 32.4 | |
| Flat/room in someone else's house/other | 2023 | 17.8 | |
| Missing | 104 | ||
| Mother had pets as a child | No, not at all | 821 | 10.7 |
| Yes, part of time | 3826 | 45.0 | |
| Yes, always | 3864 | 45.4 | |
| Missing | 2955 |