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. Author manuscript; available in PMC: 2013 Apr 5.

Published in final edited form as: Sleep Breath. 2011 Nov 20;16(4):1129–1137. doi: 10.1007/s11325-011-0616-8

Table 4.

Multiple Regression Analyses for Sleep Quality Predicting Asthma Control

Non-Severe Asthma
Step	Variables	Β	p-value	ΔR²	Total R²	F	p-value
1.	Age (years)	0.10	0.26	0.07	0.07	3.62	0.02
	BMI	0.15	0.09
	GERD	0.14	0.11
2.	Sleep quality (PSQI)	0.31	<.001	0.10	0.17	6.92	<.001

Severe Asthma
Step	Variables	Β	p-value	ΔR²	Total R²	F	p-value
1.	Age (years)	0.16	0.16	0.24	0.24	5.78	<.001
	Daytime sleepiness	0.18	0.10
	GERD	−0.07	0.54
	Oral corticosteroid use	0.46	<.001
2.	Sleep quality (PSQI)	0.26	0.01	0.06	0.19	3.37	<.001