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Table 4 Associations between use of gas heaters and hospital admission for an acute respiratory infection during the first five years of life

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

Type of heating used in the household Incidence per 1000 person-years (95% CI) Crude HR (95% CI) Adjusted HRa (95% CI)
All gas heaters
Use gas heater only 75.68 (60.70-93.23) 2.44 (1.92-3.10) 1.64 (1.29-2.09)
Use gas heater as well as other forms of heating 23.92 (20.13-28.20) 0.77 (0.63-0.94) 0.82 (0.68-0.99)
Use other forms of heating only 31.04 (28.66-33.57) 1.00 1.00
Unflued gas heaters
Use unflued gas heater only 74.23 (52.55-101.84) 2.36 (1.66-3.35) 1.48 (1.05-2.09)
Use unflued gas heater as well as other forms of heating 23.73 (18.47-30.03) 0.76 (0.58-0.98) 0.73 (0.57-0.94)
Use other forms of heating only 31.42 (29.21-33.76) 1.00 1.00
  1. aAdjusted for all maternal and child factors as mentioned in Table 3 and environmental factors (household tenure, crowding, household smoking, dampness of the house and mould or mildew in the child’s bedroom)