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Table 1 Distribution of item responses (%) for the SF-36 sub-scale items

From: Latent variable mixture models to test for differential item functioning: a population-based analysis

Item Response option
Physical Functioning (N = 9337) Limited a lot Limited a little Not limited at all
 PF1: Vigorous activities 43.9 34.2 21.9
 PF2: Moderate activities 12.7 24.4 62.9
 PF3: Lifting or carrying groceries 9.1 22.2 68.8
 PF4: Climbing several flights of stairs 15.2 29.6 55.1
 PF5: Climbing one flight of stairs 5.6 15.8 78.6
 PF6: Bending, kneeling or stooping 13.0 33.0 54.0
 PF7: Walking more than a mile 16.5 20.6 62.9
 PF8: Walking several blocks 10.8 15.0 74.2
 PF9: Walking one block 4.0 9.9 86.0
 PF10: Bathing or dressing self 2.0 6.5 91.5
Mental Health (N = 9395) All of the time Most of the time Good bit of the time Some of the time Little of the time None of the time
Have you…       
 MH1: Been a very nervous person? 1.3 3.1 5.4 17.2 29.7 43.3
 MH2: Felt so down in the dumps that nothing could cheer you up? 0.3 1.1 1.8 7.4 17.0 72.4
 MH3: Felt calm and peaceful? 10.6 46.3 18.2 15.7 5.9 3.2
 MH4: Felt downhearted and blue? 0.4 1.6 3.4 17.8 34.8 42.1
 MH5: Been a happy person? 18.5 54.8 12.9 8.7 2.9 2.3