Table 1.

Summary of single and multi-component home environmental interventions used in the assessment asthma health outcomes.

Environmental intervention studiesa	Setting	Sample size	Age (years)	Outcome measurements (Pooled risk ratios attributed to intervention) RR (95% CI)
				Urgent care clinic visits	ER Visits	Hospitalizations
Environmental education using medical providers
Hughes et al. (20) Level 2 Randomized control trial	Urban (Canada)	47	6–16	.63 (.41, .95)	.44 (.28, .67)	.71(.42, 1.16)
Stout et al. (21) Level 4 Pre-post trial	Urban (USA)	23	1–9
Shelledy et al. (22) Level 4 Pre-post trial	Urban (USA)	18	3–18
Environmental education using non-medical providers
Prinomo et al. (23) Level 49 Pre-post trial	Urban (USA)	104	≤18	.66 (.53, .82)	.56 (.44, .73)	.50 (.33,.77)
Largo et al. (24) Level 4 Pre-post trial	Urban (USA)	243	0–17
Margellos-Anast et al. (25) Level 4 Pre-post trial	Urban (USA)	50	2–16
Multi-component intervention (education using non-medical providers, allergen-impermeable covers, pest management)
Carter et al. (26) Level 1 Randomized control trial	Urban (USA)	30	5–16	.36 (.32, .41)	.63 (.53, .74)	.83 (.64, 1.08)
Sullivan et al. (27) Level 1 Randomized control trial	Urban (USA)	515	5–11
Bryant-Stephens and Li (28) Level 2 Randomized control trial	Urban (USA)	153	2–16

^aEvidence level is calculated from a modified Sackett scale containing five levels (e-Appendix 3).