Measuring health-related quality of life in adolescents and young adults: Swedish normative data for the SF-36 and the HADS, and the influence of age, gender, and method of administration

Table 3 Descriptive statistics, Cronbach's α, and score distributions for the SF-36, by method of administration.

Telephone (n = 300)	PF	RP	BP	GH	VT	SF	RE	MH	PCS	MCS
Mean	97.9	89.9	85.4	82.6	69.4	93.3	86.7	80.7	54.7	48.7
SD	7.8	22.8	18.6	15.9	18.5	14.2	27.7	15.0	5.0	9.2
α	.86	.75	.62	.71	.81	.67	.75	.82	-	-
Quartile 1	100	100	72	75	60	87.5	100	76	52.6	45.4
Median	100	100	100	87	75	100	100	84	55.7	51.3
Quartile 3	100	100	100	95	85	100	100	92	57.7	54.9
Range	0–100	0–100	22–100	15–100	10–100	0–100	0–100	20–100	31.2–69.4	5.1–64.8
% Ceiling	82.7	78.7	54.0	13.0	2.7	72.3	77.7	5.7	-	-
% Floor	0.3	2.3	0.0	0.0	0.0	0.3	5.0	0.0	-	-
Mail (n = 277–285)	PF	RP	BP	GH	VT	SF	RE	MH	PCS	MCS
Mean	94.8	86.6	81.6	79.6	64.3	88.2	81.1	76.3	53.7	46.2
SD	13.7	25.9	21.1	18.7	21.6	18.9	32.5	18.9	6.6	11.8
α	.91	.77	.79	.80	.84	.84	.78	.85	-	-
Quartile 1	95	75	72	67	50	75	66.7	68	50.7	42.5
Median	100	100	84	82	66	100	100	80	55.2	50.4
Quartile 3	100	100	100	97	80	100	100	92	57.7	54.1
Range	10–100	0–100	10–100	20–100	0–100	0–100	0–100	16–100	27.7–69.4	2.7–64.8
% Ceiling	69.5	71.6	42.8	18.2	3.5	57.5	69.5	9.1	-	-
% Floor	0.0	3.9	0.0	0.0	0.4	0.4	8.4	0.0	-	-

ISSN: 1477-7525