APPENDIX TABLE 2.

Sensitivity analysis of association between OOP asthma medication costs and asthma medication utilization and asthma -related hospitalizations, children ages 5–18

	Annual OOP cost for asthma medications
	25th percentile ($100) Mean (95% CI)	75th percentile ($190) Mean (95% CI)	p-value
Follow-up period of 90 days (rather than 365 days)
% of days covered by an asthma medication prescription	63.2 (62.1–64.2)	62.0 (61.1–62.8)	0.02
90-day rate of asthma-related hospitalization per 100 children	0.5 (0.3–0.7)	0.8 (0.5–1.1)	0.04
Requirement of 12 months without control therapy (rather than 6 months) to be included in sample
% of days covered by an asthma medication prescription	42.3 (41.2–43.5)	40.8 (39.8–41.8)	0.03
Annual rate of asthma-related hospitalizations per 100 children	1.4 (1.1–1.8)	2.2 (1.6–2.7)	0.007
Sample restricted to children initiating therapy during pollen season (April to September)
% of days covered by an asthma medication prescription	44.4 (43.2–45.6)	43.0 (42.0–44.0)	0.03

Notes: Annual OOP cost and expenditures on hospitalization are in 2010 dollars. Requirement of 12 months without control therapy (rather than 6 months) reduces sample to 4,502 children. Restricting sample to children initiating therapy during pollen season reduces sample to 2,715 children.