Table 2.

Scores for domains of SF-36 at baseline and subsequent visits in the NIPPV and control groups

SF-36 questionnaire domain/visit	Control group		NIPPV group		Test for linear trend, p value (power)		Pairwise comparisons
SF-36 questionnaire domain/visit	n	Mean % (SD)	n	Mean % (SD)	Control group	NIPPV group	Mean difference	95% CI	p Value (power)
The scores in italics are normal population mean (SD) SF-36 scores for each domain, calculated for both NIPPV and control groups, matching for age and sex.
NIPPV = noninvasive positive pressure ventilation.
Vitality		61 (3)		61 (2)
Baseline	11	61 (26)	16	27 (12)
Visit 1	11	60 (28)	16	46 (16)	0.871 (0.05)	0.001 (0.95)	24	9 to 38	0.002 (0.9)
Visit 2	6	57 (26)	10	42 (16)	0.448 (0.16)	0.011 (0.81)	20	0.1 to 39	0.049 (0.52)
Visit 3	4	60 (26)	7	29 (14)	0.385 (0.21)	0.002 (0.96)	29	5 to 54	0.024 (0.67)
Visit 4	4	45 (13)	4	45 (17)	0.607 (0.17)	0.085 (0.56)	1	−29 to 31	0.946 (0.05)
Visit 5	NA		3	52 (15)		0.019 (0.83)
Visit 6	NA		2	45 (7)		0.060 (0.62)
Physical functioning		76 (8)		76 (8)
Baseline	11	28 (32)	16	19 (22)
Visit 4	4	27 (31)	4	4 (8)	0.028 (0.76)	0.130 (0.47)	19	−20 to 59	0.264 (0.18)
Bodily pain		69 (3)		70 (2)
Baseline	11	80 (17)	16	74 (25)
Visit 4	4	62 (18)	4	64 (28)	0.730 (0.12)	0.681 (0.15)	14	−54 to 27	0.426 (0.11)
Role physical		73 (10)		72 (9)
Baseline	11	32 (39)	16	20 (33)
Visit 4	4	8 (14)	4	12 (14)	0.042 (0.68)	0.132 (0.47)	19	−56 to 18	0.253 (0.18)
Role emotional		80 (4)		80 (3)
Baseline	11	70 (41)	15	75 (37)
Visit 4	4	67 (58)	4	83 (33)	0.461 (0.19)	0.360 (0.27)	7	−47 to 34	0.695 (0.06)
Social functioning		82 (3)		83 (2)
Baseline	11	59 (29)	16	56 (28)
Visit 4	4	50 (35)	4	44 (28)	0.504 (0.18)	0.390 (0.25)	10	−60 to 39	0.624 (0.07)
General health		66 (5)		65 (5)
Baseline	11	42 (17)	16	39 (25)
Visit 4	4	44 (21)	4	37 (41)	0.601 (0.15)	0.763 (0.12)	10	−32 to 52	0.595 (0.95)
Mental health		76 (1)		77 (1)
Baseline	11	81 (13)	16	71 (16)
Visit 4	4	84 (8)	4	90 (11)	0.261 (0.3)	0.364 (0.27)	7	−23 to 9	0.311 (0.15)