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Table 2 Descriptive statistics and internal consistency (n = 5396)

From: Measurement properties and normative data for the Norwegian SF-36: results from a general population survey

Scale/item Percent missing Percent complete data Mean Standard deviation Percent floor Percent ceiling Cronbach’s alpha (scale)/item scale correlation Percent scaling success
Physical functioning 0.87 95.37 86.44 20.42 0.45 35.60 0.92 97.50
1 Vigorous activites 1.54   2.16 0.76 22.55 38.15 0.55 75
2 Moderate activities 1.26   2.71 0.56 5.61 76.71 0.83 100
3 Lifting or carrying groceries 1.46   2.79 0.50 4.29 83.49 0.76 100
4 Climbing several flights of stairs 1.15   2.71 0.58 6.22 76.90 0.80 100
5 Climbing one flight of stairs 1.61   2.87 0.40 2.41 89.83 0.75 100
6 Bending, kneeling, stooping 1.17   2.69 0.59 6.43 75.51 0.74 100
7 Walk more than a mile 1.35   2.70 0.61 7.95 77.46 0.79 100
8 Walking several blocks 1.70   2.87 0.42 3.15 89.69 0.78 100
9 Walking one block 1.98   2.91 0.34 1.85 92.93 0.70 100
10 Bathing or dressing 0.89   2.91 0.34 1.66 92.89 0.61 100
Role-physical 0.85 97.59 76.64 37.39 14.62 66.32 0.91 100
1 Cut down time spent on work 1.15   1.81 0.40 19.35 80.65 0.78 100
2 Accomplished less than would like 1.02   1.72 0.45 27.61 72.39 0.76 100
3 Limited in kid of work/activities 1.76   1.77 0.42 23.30 76.70 0.80 100
4 Difficulty performing work/activities 0.95   1.77 0.42 22.60 77.40 0.83 100
Bodily paina 0.26 97.70 73.62 25.83 0.63 35.56 0.90 100
1 Intensity of bodily pain 1.98   4.67 1.40 1.91 36.66 0.82 100
2 Extent pain interfered with work 0.57   4.69 1.31 2.05 35.58 0.82 100
General healtha 2.52 95.89 75.25 21.72 0.23 8.21 0.82 100
1 Rating of general health 0.61   3.68 1.04 3.56 12.40 0.68 100
2 I seem to get sick easier than others 3.04   4.44 1.03 2.01 73.13 0.51 100
3 I seem as healthy as anyone I know 2.19   4.26 1.10 3.58 59.44 0.63 100
4 I expect my health to get worse 2.59   3.74 1.26 4.85 42.69 0.52 100
5 My health is excellent 2.46   3.92 1.31 6.56 39.83 0.76 100
Vitality 1.22 95.79 60.72 20.61 0.73 2.40 0.85 100
1 Full of pep 2.46   3.62 1.31 6.75 6.38 0.64 100
2 Have a lot of energy 2.26   3.55 1.36 8.57 6.12 0.75 100
3 Feel worn out 1.85   4.52 1.15 2.59 16.11 0.68 100
4 Feel tired 1.30   4.45 1.13 2.22 13.31 0.70 100
Social Functioning 0.17 98.85 86.27 21.18 0.84 58.40 0.81 100
1 Extent health problems interfered 0.61   4.51 0.87 1.55 68.73 0.69 100
2 Frequency health problems interfered 0.70   4.40 0.95 2.11 63.55 0.69 100
Role-Emotional 1.58 97.72 84.23 31.67 8.53 76.84 0.84 100
1 Cut down time spent on work 1.41   1.87 0.34 12.93 87.07 0.71 100
2 Accomplished less than would like 1.46   1.80 0.40 20.50 79.50 0.74 100
3 Work not done as carefully as usual 1.65   1.86 0.35 13.96 86.04 0.68 100
Mental Health 1.57 95.53 80.27 15.47 0.13 6.93 0.82 100
1 Been a very nervous person 1.98   5.60 0.80 0.55 72.75 0.60 100
2 Feel down in the dumps 2.11   5.75 0.70 0.40 84.13 0.62 100
3 Felt calm and peaceful 2.02   4.36 1.34 3.67 20.65 0.65 100
4 Felt downhearted and blue 2.37   5.30 0.95 0.87 51.90 0.68 100
5 Been a happy person 1.74   4.07 1.19 2.24 9.64 0.61 100
Health Transition 0.46 99.54 51.26 16.53 1.62 3.91 - -
1 Change in health from one year ago 0.46   3.05 0.66 - - - -
Physical Component Summary 4.52 95.48 49.49 10.16 - - - -
Mental Component Summary 4.52 95.48 52.19 9.08 - - - -
  1. aRAND mean (SD) scores for bodily pain 76.90 (24.94) and general health perception 73.84 (21.45)