Ambulatory oxygen improves quality of life of COPD patients: a randomised controlled study

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Fig. 1.—
Study design and patient recruitment details.

Table 1—

Patient characteristics including acute responses to cylinder gas

Table 2—

Health‐related quality of life (HRQL) measures for 41 patients

	Baseline	Δ cylinder oxygen‐cylinder air	p‐value
Disease specific HRQL
CRQ^#
Dyspnoea (5–35)	16.6 (5.3)	2.0 (0.9)	0.02
Fatigue (4–28)	15.3 (4.9)	1.8 (0.7)	0.02
Emotional function (7–49)	34.3 (8.0)	3.3 (1.2)	0.006
Mastery (4–28)	19.5 (4.8)	1.8 (0.7)	0.008
Total (20–140)	85.8 (18.5)	8.8 (2.8)	0.002
HAD^¶
Anxiety (0–21)	5.6 (4.1)	−1.6 (0.6)	0.009
Depression (0–21)	4.3 (2.5)	−1.0 (0.5)	0.05
Generic HRQL
SF-36^#
Physical functioning (0–100)	33.0 (18.8)	1.6 (3.5)	0.6
Role physical (0–100)	15.2 (27.3)	16.8 (5.5)	0.01
Bodily pain (0–100)	73.4 (26.3)	5.3 (5.0)	0.3
General health (0–100)	42.9 (22.8)	6.1 (2.9)	0.04
Vitality (0–100)	48.3 (20.5)	2.9 (3.0)	0.3
Social functioning (0–100)	67.1 (24.2)	10.5 (5.2)	0.05
Role emotional (0–100)	60.2 (44.2)	18.3 (7.7)	0.02
Mental health (0–100)	75.6 (14.7)	4.0 (2.7)	0.1

Data are presented as mean (sd) for baseline and mean (se) for Δ cylinder oxygen-cylinder air
CRQ: chronic respiratory questionnaire
HAD: hospital anxiety and depression
SF-36: short-form-36 health survey questionnaire
^#: higher scores indicate better HRQL
^¶: higher scores indicate worse emotional function