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

Table 7 Spearman rank correlations between RAND-36/12 composite scores and related variables

	Age	Sex	Body mass index	Physical Activity	Rheumatic disease	Depression
RAND-36 PCS unweighted	− 0.21	0.06	− 0.21	0.27	− 0.26	− 0.21
RAND-36 PCS oblique	− 0.13	0.08	− 0.20	0.27	− 0.26	− 0.24
RAND-12 PCS unweighted	− 0.25	0.06	− 0.23	0.30	− 0.24	− 0.20
RAND-12 PCS oblique	− 0.12	0.10	− 0.19	0.29	− 0.23	− 0.25
RAND-36 MCS unweighted	0.11	0.10	− 0.07	0.20	− 0.14	− 0.33
RAND-36 MCS oblique	0.10	0.10	− 0.09	0.22	− 0.17	− 0.33
RAND-12 MCS unweighted	0.10	0.11	− 0.07	0.21	− 0.15	− 0.32
RAND-12 MCS oblique	0.09	0.11	− 0.09	0.23	− 0.17	− 0.32

Age (years, continuous); sex (women = 0, men = 1), body mass index (units, continuous), physical activity (strenuous physical activity: never = 0, less than 1 h per week = 1, 1–2 h per week = 2, ≥ 3 h per week = 3), rheumatic disease (no = 0, yes = 1), depression (no = 0, yes = 1)

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