TABLE 3

DID models estimating relative changes in health services utilisation and PFT completion

Groups	*1-year prior versus* study year**				*1-year prior study versus* 1-year post**				*Study year versus* 1-year post-study**
Groups	Estimate (se)	RRR	95% CI	p-value	Estimate (se)	RRR	95% CI	p-value	Estimate (se)	RRR	95% CI	p-value
Asthma hospitalisations per 100 prevalent asthma
Non-Breathe	0.231 (0.75)	1.26	0.29, 5.51	0.759	−0.195 (0.62)	0.82	0.24, 2.77	0.754
Population controls	0.552 (0.99)	1.74	0.25, 12.24	0.579	−0.490 (0.81)	0.61	0.12, 3.02	0.547
Breathe	Reference				Reference				Reference
Asthma emergency department visits per 100 prevalent asthma
Non-Breathe	0.164 (0.38)	1.18	0.56, 2.46	0.662	−0.077 (0.33)	0.93	0.48, 1.77	0.816	−0.299 (0.55)	0.74	0.25, 2.16	0.583
Population controls	0.706 (0.40)	2.03	0.93, 4.42	0.077	0.396 (0.32)	1.49	0.79, 2.80	0.219	0.140 (0.55)	1.15	0.39, 3.37	0.799
Breathe	Reference				Reference				Reference
Asthma physician office visits per person-year
Non-Breathe	−0.090 (0.11)	0.90	0.73, 1.14	0.419	0.003 (0.09)	1.00	0.84, 1.20	0.974	0.106 (0.13)	1.11	0.87, 1.43	0.403
Population controls	0.097 (0.09)	1.10	0.92, 1.32	0.295	−0.009 (0.08)	0.99	0.85, 1.15	0.902	0.185 (0.11)	1.20	0.98, 1.48	0.081
Breathe	Reference				Reference				Reference
Completion of PFT per person-year
Non-Breathe	−0.096 (0.12)	0.91	0.72, 1.15	0.432	0.006 (0.11)	1.01	0.81, 1.25	0.956	0.104 (0.14)	1.11	0.85, 1.46	0.452
Population controls	0.138 (0.12)	1.15	0.91, 1.44	0.239	0.100 (0.10)	1.11	0.91, 1.34	0.303	0.213 (0.13)	1.24	0.96, 1.60	0.105
Breathe	Reference				Reference				Reference

Asthma hospitalisation models for study year versus 1-year post did not converge. DID: difference-in-difference; PFT: pulmonary function testing; RRR: relative risk ratio.