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Table 1 Characteristics of the internal living environment as described at age nine months for 6112 cohort children

From: Internal living environment and respiratory disease in children: findings from the Growing Up in New Zealand longitudinal child cohort study

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)
  1. aHousehold crowding was measured as a ratio of household occupants to bedrooms
  2. bMultiple responses allowed