Predicting outcome in frozen shoulder (shoulder capsulitis) in presence of comorbidity as measured with subjective health complaints and neuroticism

Table 5 Multiple regression models with backward elimination for participants (n = 105, control and intervention groups) with the Shoulder Pain and Disability Index (SPADI) at 8 weeks and change in SPADI from baseline to 8 weeks as dependent variables

	Initial model			Final model
	B	p-value	R²	B	p-value	R²
SPADI at 8 weeks			0.30			0.29
SHC Pseudoneurology baseline	2.4	0.001		2.6	< 0.001
Gender (male = 0; female = 1)	0.78	0.85
Age	− 0.36	0.15
Group allocation (control = 0; intervention = 1)	− 25.1	< 0.001		− 24.8	< 0.001
Change in SPADI from baseline to 8 weeks			0.36			0.36
SHC Pseudoneurology baseline	0.19	0.77
Gender (male = 0; female = 1)	11.78	0.002		11.99	0.002
Age	0.48	0.04		0.47	0.04
Group allocation (control = 0; intervention = 1)	19.50	< 0.001		19.73	< 0.001
Shoulder pain duration	0.93			0.91	0.013

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