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Table 3 Descriptive statistics, Cronbach's α, and score distributions for the SF-36, by method of administration.

From: Measuring health-related quality of life in adolescents and young adults: Swedish normative data for the SF-36 and the HADS, and the influence of age, gender, and method of administration

Telephone
(n = 300)
PF RP BP GH VT SF RE MH PCS MCS
Mean 97.9 89.9 85.4 82.6 69.4 93.3 86.7 80.7 54.7 48.7
SD 7.8 22.8 18.6 15.9 18.5 14.2 27.7 15.0 5.0 9.2
α .86 .75 .62 .71 .81 .67 .75 .82 - -
Quartile 1 100 100 72 75 60 87.5 100 76 52.6 45.4
Median 100 100 100 87 75 100 100 84 55.7 51.3
Quartile 3 100 100 100 95 85 100 100 92 57.7 54.9
Range 0–100 0–100 22–100 15–100 10–100 0–100 0–100 20–100 31.2–69.4 5.1–64.8
% Ceiling 82.7 78.7 54.0 13.0 2.7 72.3 77.7 5.7 - -
% Floor 0.3 2.3 0.0 0.0 0.0 0.3 5.0 0.0 - -
Mail
(n = 277–285)
PF RP BP GH VT SF RE MH PCS MCS
Mean 94.8 86.6 81.6 79.6 64.3 88.2 81.1 76.3 53.7 46.2
SD 13.7 25.9 21.1 18.7 21.6 18.9 32.5 18.9 6.6 11.8
α .91 .77 .79 .80 .84 .84 .78 .85 - -
Quartile 1 95 75 72 67 50 75 66.7 68 50.7 42.5
Median 100 100 84 82 66 100 100 80 55.2 50.4
Quartile 3 100 100 100 97 80 100 100 92 57.7 54.1
Range 10–100 0–100 10–100 20–100 0–100 0–100 0–100 16–100 27.7–69.4 2.7–64.8
% Ceiling 69.5 71.6 42.8 18.2 3.5 57.5 69.5 9.1 - -
% Floor 0.0 3.9 0.0 0.0 0.4 0.4 8.4 0.0 - -