Table 2.

SF-12 v2 items and descriptive statistics (n =1000)

Item description (scale)	Mean	SD	Item response category frequency (%)
			1	2	3	4	5
Moderate activities (PF)	2.85	0.40	1.6	11.6	86.8	NA	NA
Climb several flights of stairs (PF)	2.81	0.45	2.4	14.5	83.1	NA	NA
Accomplished less, physical (RP)	4.53	0.84	0.8	3.6	7.4	18.1	70.1
Limited in kind of work (RP)	4.72	0.69	0.4	2.3	4.6	10.4	82.3
Pain-interference (BP)*	4.70	0.68	0.7	1.2	5.1	13.4	79.6
Health in general (GH)*	3.73	0.81	0.6	9.4	46.9	36.2	6.9
Energy (VT)*	3.71	0.90	2.1	8.4	21.6	52.4	15.5
Social time (SF)	4.76	0.61	0.3	1.1	4.1	11.5	83.0
Accomplished less, emotional (RE)	4.61	0.73	0.3	2.2	6.5	18.2	72.8
Did work less carefully (RE)	4.67	0.66	0.0	1.6	6.0	16.6	75.8
Calm and peaceful (MH)*	3.92	0.76	1.4	5.0	10.1	67.7	15.8
Downhearted and blue (MH)	4.38	0.81	0.5	2.6	10.0	32.3	54.6

NA: Not applicable because these two items have only three response options.

*Item recoded; hence, higher scores indicate a better condition.