Table 2.

Summary statistics and assessment of item-scale assumptions (n=206)

Subscale	Equivalency		Floor/Ceiling1		Corrected item-subscale correlations		Item-subscale correlations		Distribution
	Mean range	SD range	Floor (%)	Ceiling (%)	Range	Success rate2	Range	Success rate3	Skewness	Kurtosis
PF	48.3-91.5	24.9-37.4	1.0	15.0	0.33-0.72	9/10	0.47-0.79	10/10	-1.28	1.51
RP	56.3-64.6	47.9-49.5	24.3	39.8	0.64-0.74	4/4	0.80-0.86	4/4	-0.53	-1.33
BP	69.6.-82.5	21.9-23.2	0.5	18.4	0.57-0.57	2/2	0.88-0.89	2/2	-0.80	0.36
GH	40.9-71.6	18.9-30.7	1.0	2.4	0.34-0.60	4/5	0.52-0.76	5/5	-0.63	0.65
VT	62.7-69.7	28.5-29.6	1.0	3.4	0.43-0.56	4/4	0.69-0.78	4/4	-0.71	0.32
RE	61.7-65.1	47.8-48.7	24.3	52.4	0.70-0.75	3/3	0.87-0.89	3/3	-0.54	-1.48
MH	73.6-78.1	22.5-27.7	1.0	11.2	0.31-0.61	4/5	0.58-0.76	5/5	-0.96	1.24
SF	82.8-87.6	22.9-22.5	0.5	53.9	0.55-0.55	2/2	0.88-0.88	2/2	-1.28	0.88

PF, physical function; RP, role limitation due to physical health; BP, bodily pain; GH, general health perception; VT, vitality; RE, role limitations due to emotional problems; MH, mental health; SF, social functioning.

¹The percentage of respondents with minimum and maximum responses.

²The number of corrected item-subscale correlations ≥0.40 divided by the number of items in a given subscale.

³The number of item-subscale correlations that were higher than the correlations between the item and other subscales, divided by the number of items in a given subscale.