Table 9.

Frequency table for hospital admissions in a trial of insulating houses. Values are number of times admitted during winter of the second year (number of people admitted that many times) unless stated otherwise

Outcome measure	Before intervention			After intervention			Odds ratio (95% CI)
	Intervention group	Control group		Intervention group	Control group		Unadjusted	Adjusted
Number of people admitted with a respiratory condition as main code	0 (1372); 1 (7)	0 (1330); 1 (9); 2 (1)		0 (1378); 1 (7); 2 (1)	0 (1331); 1 (13); 2 (1)		0.58 (0.04 to 8.93) P=0.697	0.21 (0.01 to 3.13); P=0.255*
Number of people admitted with a control condition as main code	0 (1331); 1 (44); 2 (4)	0 (1284); 1 (51); 2 (4); 3 (1)		0 (1343); 1 (40); 2 (3)	0 (1297); 1 (43); 2 (5)		1.48 (0.36 to 6.06) P=0.589	0.47 (0.19 to 1.18); P=0.107*

Outcomes were measured by using a unique identifier.

All adjusted odds ratios were adjusted for age, sex, and ethnic origin.

Twelve babies were born in the year between the first and second winter; 7 in the intervention group and 5 in the control group.

*Results derived by using the zero inflated negative binomial model.