Table 1.
Characteristics of the internal living environment as described at age nine months for 6112 cohort children
| Internal living environment | N (%) |
|---|---|
| Housing tenure (N = 5640) | |
| Owner occupancy | 2916 (52) |
| Tenancy | 2724 (48) |
| Crowding indexa (N = 6111) | |
| <1 (low) | 336 (6) |
| 1- < 2 (medium) | 4430 (72) |
| 2+ (high) | 1345 (22) |
| Maternal smoking (N = 6110) | |
| Yes | 870 (14) |
| No | 5240 (86) |
| Smoking by others in the household (N = 6109) | |
| Yes | 1835 (30) |
| No | 4274 (70) |
| Heating the house (N = 6108) | |
| Yes | 5449 (89) |
| No | 659 (11) |
| Form/s of heating used in the houseb (N = 5447) | |
| Electric heater | 4854 (89) |
| Flued gas heater | 769 (14) |
| Unflued portable gas heater | 671 (12) |
| Wood burner | 1498 (28) |
| Coal burner | 96 (2) |
| Others | 72 (1) |
| Form/s of heating used in the room where child sleeps at nightb (N = 5297) | |
| No heating | 763 (14) |
| Electric heater | 4337 (82) |
| Flued gas heater | 138 (3) |
| Unflued portable gas heater | 74 (1) |
| Wood burner | 243 (5) |
| Coal burner | 16 (0) |
| Others | 39 (1) |
| Dampness of the house (N = 6070) | |
| Never or hardly ever | 3053 (50) |
| Not very often | 1772 (29) |
| Quite often | 908 (15) |
| Always or almost always | 337 (6) |
| Heavy condensation in the room where baby sleeps at night (N = 6084) | |
| Never or hardly ever | 3109 (51) |
| Not very often | 1654 (27) |
| Quite often | 951 (16) |
| Always or almost always | 370 (6) |
| Mould or mildew in the walls or ceilings in the room where child sleeps at night in the past two weeks (N = 6101) | |
| Yes | 769 (13) |
| No | 5332 (87) |
aHousehold crowding was measured as a ratio of household occupants to bedrooms
bMultiple responses allowed