Table 4.

The quality of life assessed by SF-36 scores in insomniac and non-insomniac participants with chronic obstructive pulmonary disease^a

SF-36 dimension	Insomnia (mean ± SD)	No insomnia (mean ± SD)	P
Physical functioning (PF)	36.5 ± 28.2	39.0 ± 24.3	0.55
Role physical (RP)	26.5 ± 37.6	35.7 ± 40.3	0.16
Bodily pain (BP)	51.6 ± 22.6	67.3 ± 24.6	< 0.001
General health (GH)	43.9 ± 19.2	47.1 ± 21.7	0.35
Vitality (VT)	33.8 ± 19.0	48.8 ± 20.1	< 0.001
Social functioning (SF)	62.0 ± 28.1	73.9 ± 22.3	0.003
Role-emotional (RE)	63.2 ± 43.7	76.3 ± 38.6	0.05
Mental health (MH)	68.6 ± 20.6	76.4 ± 17.1	0.03

^aThe ‘scores in COPD’ refer to those seen in an earlier study of more than 300 male COPD participants.¹⁸ The last column provides scores seen in participants with severe insomnia in another study for comparison.¹⁷ COPD, chronic obstructive pulmonary disease; SD, standard deviation.