Table 2.

Association between exposure (discharge from hospital) and outcome (asthma-related admission in the next 30 days)

Exposure	Frequency		Adjusted RR	P-value
	Case window	(95% CI)†Control window
	N = 6,333	N = 10,737
Any discharge	687 (10.8%)	849 (7.9%)	1.40 (1.22 – 1.59)	<0.001*
Asthma-related discharge	442 (7.0%)	389 (3.6%)	1.99 (1.65 – 2.39)	<0.001*
Non-asthma-related discharge	273 (4.3%)	495 (4.6%)	0.88 (0.74 – 1.04)	0.141
Respiratory-related discharge	523 (8.3%)	497 (4.6%)	1.89 (1.60 – 2.22)	<0.001*
Respiratory-related, non-asthma discharge	89 (1.4%)	124 (1.2%)	1.23 (0.90 – 1.68)	0.199
Non-respiratory-related discharge	189 (3.0%)	381 (3.5%)	0.78 (0.63 – 0.96)	0.017*

*Significant at 0.05 level.

†All RRs are adjusted for the following variables estimated in the 180 days prior to the start of the time window: number of asthma-related hospital admissions, outpatient services use, medication dispensations, number of dispensations of short-acting beta-agonists, inhaled corticosteroids, and combined inhaled corticosteroids and long-acting beta-agonists, as well as total number of hospital admissions, outpatient services use, medication dispensations, and the Charlson co-morbidity index.