Table 2. Univariate correlation of the case-control groups and total sample.

Pearson’s (r) coefficienta		Total sample (n = 132)	Painful shoulders (n = 66)	Non-painful shoulders (n = 66)
Age	Anterior deltoid PPT	−0.044	−0.021	0.037
	ECRB PPT	−0.009	0.015	0.170
	Grip strength	−0.327*	−0.488*	−0.083
	Pain intensity	N/A	−0.003	N/A
Anterior deltoid PPT	ECRB PPT	0.806*	0.590*	0.677*
	Grip strength	0.315*	0.161	0.372**
	Pain intensity	N/A	−0.144	N/A
ECRB PPT	Grip strength	0.303*	0.151	0.442*
	Pain intensity	N/A	−0.146	N/A
Grip strength	Pain intensity	N/A	−0.109	N/A

Notes.

Abbreviations:

ECRB

extensor carpi radialis brevis

PPT

pressure pain threshold

N/A

Not applicable

^aCorrelations were interpreted as weak (0.00–0.40), moderate (0.41–0.69) or strong (0.70–1.00) (Mitchell et al., 2005).

^*P < 0.001.

^**P = 0.002.