Table 3

Relation between health related quality of life and nocturnal hypoxaemia

	Mean overnight Sao₂			Abnormal sleep study
	Regression coefficient^3-150	95% CI	p value		Odds ratio^3-150	95% CI	p value
CRQ-SR
Dyspnoea	0.38	–0.64 to 1.40	0.5		0.75	0.46 to 1.23	0.3
Fatigue	0.80	–0.17 to 1.75	0.1		0.67	0.42 to 1.08	0.1
Emotion	0.50	–0.61 to 1.61	0.4		0.91	0.57 to 1.47	0.7
Mastery	1.15	0.28 to 2.02	0.01		0.80	0.52 to 1.22	0.3

SF-36
Physical functioning	0.23	0.00 to 0.46	0.05		0.87	0.77 to 0.99	0.03
Role physical	0.60	–0.41 to 1.60	0.2		0.71	0.43 to 1.17	0.2
Role mental	–0.16	–1.19 to 0.86	0.8		0.77	0.49 to 1.22	0.3
Social functioning	0.60	0.14 to 1.05	0.01		0.77	0.60 to 0.98	0.03
Pain	0.11	–0.42 to 0.63	0.7		0.88	0.69 to 1.11	0.3
Mental health	0.22	–0.01 to 0.44	0.06		0.94	0.85 to 1.05	0.3
Energy	0.41	0.14 to 0.68	0.004		0.77	0.65 to 0.92	0.005
Health perception	0.15	–0.16 to 0.46	0.3		0.84	0.72 to 0.99	0.04

HADS
Anxiety	–0.05	–0.25 to 0.15	0.6		1.04	0.91 to 1.19	0.6
Depression	–0.19	–0.49 to 0.12	0.3		1.13	0.97 to 1.32	0.1

EPSS	–0.15	–0.43 to 0.14	0.3		1.27	1.07 to 1.52	0.006

CRQ-SR = Chronic Respiratory Questionnaire; SF-36 = Short Form 36; HADS = Hospital Anxiety Depression Scale; EPSS = Epworth Sleepiness Score; Sao ₂ = oxygen saturation.
↵3-150 Regression coefficients are presented for each change in mean overnight Sao ₂ predicted by each unit increase in questionnaire score. All regression coefficients and odds ratios are adjusted for age and sex.