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Table 3 Descriptive statistics of the RAND-36/12 compositive z-scores (means = 0 and standard deviations = 1) and features of score distributions

From: Correlated physical and mental health composite scores for the RAND-36 and RAND-12 health surveys: can we keep them simple?

RAND-36 subscales RAND-36 PCS unweighted RAND-36 PCS oblique RAND-36 MCS unweighted RAND-36 MCS oblique RAND-12 PCS unweighted RAND-12 PCS oblique RAND-12 MCS unweighted RAND-12 MCS oblique
Median 0.40 0.37 0.33 0.25 0.55 0.37 0.28 0.23
Mode 1.00 1.20 0.62 1.53 0.82 0.82 0.67 0.78
Skewness  − 1.10  − 1.10  − 1.63  − 1.21  − 1.09  − 1.11  − 1.24  − 1.08
Kurtosis 0.20 0.38 2.60 1.59 0.15 0.40 1.28 1.11
% Floor 0 0 0 0 0.1 0.1 0.1 0.1
% Ceiling 2.7 0.7 1.5 0.7 8.3 1.3 3.9 1.3
Corrected item-total correlation PF = 0.70
RP = 0.74
BP = 0.69
GH = 0.68
NA VT = 0.63
SF = 0.71
RE = 0.58
MH = 0.72
NA PF = 0.66
RP = 0.72
BP = 0.71
GH = 0.61
NA VT = 0.58
SF = 0.62
RE = 0.52
MH = 0.68
NA
  1. PCS Physical Composite Summary; MCS Mental Composite Summary.; PF physical functioning, RP physical role functioning, BP bodily pain, GH general health, VT vitality, SF social functioning, RE role functioning, MH mental health, NA not applicable