Performance of the Dutch SF-36 version 2 as a measure of health-related quality of life in patients with rheumatoid arthritis

Table 3 Descriptive statistics of the transformed SF-36v2 scale scores and normed summary scores (N = 1884)

Scales	Range ^a	Mean	Median	SD	Skewness	Kurtosis	Floor (%)^b	Ceiling (%)^c
PF	0 to 100	64.55	70.00	26.06	−0.53	−0.72	1.1	6.4
RP	0 to 100	57.92	50.00	27.44	−0.02	−0.83	2.5	15.5
BP	0 to 100	61.01	62.00	21.83	−0.09	−0.43	0.5	9.4
GH	0 to 100	54.61	52.00	19.60	0.03	−0.39	0.1	1.1
VT	0 to 100	57.96	56.25	19.54	−0.08	−0.43	0.1	2.1
SF	0 to 100	77.62	87.50	22.76	−0.85	0.07	0.5	35.8
RE	0 to 100	72.98	75.00	27.15	−0.68	−0.50	1.6	37.0
MH	0 to 100	75.92	80.00	17.92	−0.88	0.60	0.1	9.3
PCS ^d	6 to 65	41.15	41.43	9.85	−0.24	−0.43	-	-
MCS ^d	9 to 77	50.06	52.45	10.68	−0.79	0.26	-	-

^aObserved scores; ^bPercentage of respondents with worst possible score; ^cPercentage of respondents with best possible score; ^dThe component summary scores are standardized using normative data from the 1998 US general population with a mean score of 50 and an SD of 10. PF, Physical functioning; RP, Role-physical; BP, Bodily pain; GH, General health; VT, Vitality; SF, Social functioning; RE, Role-emotional; MH, Mental health; HT, Health transition; PCS, Physical component summary; MCS, Mental component summary.

ISSN: 1477-7525