Table 3.
Characteristics of the study children at age 13 years in comparison to excluded children at age 13 years (with no pet ownership data due to non-response)
| Variable | Level | Excluded Study Children (n = 4120) |
Included study children (n = 2332) |
|---|---|---|---|
| Number (%) | Number (%) | ||
| Gender | Male | 2383 (58) | 751 (32) |
| Female | 1737 (42) | 1580 (68) | |
| Ethnicity | White | 2710 (97) | 1868 (97) |
| Non-white | 78 (3) | 50 (3) | |
| Number of people in household | 3 | 487 (15) | 323 (15) |
| 4 | 1525 (48) | 1138 (51) | |
| 5+ | 1149 (36) | 774 (34) | |
| Presence of an older sibling at 18 months | Yes | 2326 (59) | 1140 (51) |
| No | 1599 (41) | 1095 (49) | |
| Maternal education | CSE or no qualification (lowest) | 675 (17) | 222 (10) |
| Vocational | 412 (10) | 166 (7) | |
| O level | 1484 (37) | 722 (32) | |
| A level | 988 (25) | 647 (29) | |
| Degree (highest) | 429 (11) | 478 (21) | |
| Paternal education | CSE or no qualification (lowest) | 912 (24) | 366 (16) |
| Vocational | 372 (10) | 165 (7) | |
| O level | 907 (24) | 451 (20) | |
| A level | 1074 (28) | 645 (29) | |
| Degree (highest) | 584 (15) | 608 (27) | |
| Maternal social class | Professional (highest) | 167 (5) | 189 (9) |
| Managerial and technical | 1069 (32) | 814 (36) | |
| Skilled: non-manual | 1490 (44) | 892 (40) | |
| Skilled: manual | 250 (7) | 131 (6) | |
| Partly skilled | 313 (9) | 176 (8) | |
| Unskilled (lowest) | 73 (2) | 33 (2) | |
| Paternal social class | Professional (highest) | 350 (10) | 344 (15) |
| Managerial and technical | 1202 (33) | 839 (38) | |
| Skilled: non-manual | 389 (11) | 274 (12) | |
| Skilled: manual | 1211 (34) | 574 (26) | |
| Partly skilled | 339 (9) | 167 (8) | |
| Unskilled (lowest) | 120 (3) | 37 (2) | |
| Maternal age at delivery | < 21 years | 174 (4) | 56 (3) |
| 21–30 years | 2596 (63) | 1292 (58) | |
| > 30 years | 1350 (33) | 887 (40) | |
| Mother had pets as a child | No, not at all | 256 (7) | 196 (9) |
| Yes, part of time | 1574 (43) | 994 (45) | |
| Yes, always | 1862 (50) | 1045 (47) | |
| House type | Detached | 1073 (26) | 764 (34) |
| Semi-detached | 1586 (39) | 801 (36) | |
| End terrace | 403 (10) | 198 (9) | |
| Terraced | 871 (21) | 396 (18) | |
| Flat/room in someone else’s house/other | 170 (4) | 76 (3) |