TABLE 3 -.

Beta regression for Shoulder Pain and Disability Index

Parameter	Regression (B) coefficient (95% CI)	OR
Intercept	−5.04 (−11.72 to 1.63)	0.01
Age	0.03 (0.01 to 0.05) *	1.03
Weight	0.02 (−0.01 to 0.04)	1.02
Height	0.01 (−0.04 to 0.05)	1.01
Sex (male = 1)	0.66 (−0.05 to 1.38)	1.94
Neck flexion	0.03 (0.01 to 0.05) *	1.03
Neck extension	−0.001 (−0.02 to 0.02)	1.00
Neck protraction	−0.16 (−0.29 to -0.03) *	0.85
Neck retraction	−0.11 (−0.34 to 0.12)	0.90
Neck lateral flexion (affected side)	0.04 (0.01 to 0.07) *	1.04
Neck lateral flexion (unaffected side)	−0.013 (−0.05 to 0.03)	0.97
Neck rotation (affected side)	−0.03 (−0.06 to 0.003)	0.99
Neck rotation (unaffected side)	0.01 (−0.02 to 0.04)	1.01
Standardized weighted residuals 2:     Min       1Q         Median      3Q       Max −2.04    −0.89        −0.04        0.91     2.54 Phi coefficient (precision model with identity link):           Estimate      Std. Error       z value        95% CI (phi)   11.94         2.38                   5.03       7.29 to 16.60 Type of estimator: maximum likelihood Log-likelihood: 34.4 on 14 degrees of freedom Pseudo R-squared: 0.474

Abbreviations: CI, confidence interval; 1Q, first quartile; 3Q, third quartile. OR refers to the odds ratio for the outcome measure per unit change in the predictor variable.* p < 0.05