Factors influencing participation in a vascular disease prevention lifestyle program among participants in a cluster randomized trial

Table 4 Multi-level logistic regression models for high attendance at lifestyle modification program

Explanatory variables		Empty model	Model 1¹
Participant Characteristics		OR (95% CI)	OR (95% CI)
SEIFA index²	Least disadvantaged		1.00 (reference)
	Intermediate disadvantage		1.24 (0.35-4.32)
	Most disadvantaged		2.17 (0.21-22.15)
Employment status	Working		1.0 (reference)
Employment status	Not working³		2.39 (1.15-4.94)*
Psychological distress	Low/moderate distress		1.00 (reference)
(K10 score: 16+)	High distress		2.17 (1.10-4.30)*
Practice Characteristics
Practice size	Large practice (5+ GPs)		1.00 (reference)
	Medium practice (3–4 GPs)		1.73 (0.60-5.05)
	Small practice (1–2 GPs)		3.46 (0.79-15.03)
Practice employs or rents rooms to allied health professional	No		1.00 (reference)
	Yes		2.24 (0.34-14.67)
Practice has written protocol for preventative care	No		1.00 (reference)
Practice has written protocol for preventative care	Yes		1.60 (0.33-7.83)
Between practice variance (SE³)		0.410 (0.277)	0.023 (0.132)
Intra class correlation		0.111	0.007
Explained variance ⁴ (%)		-	94.4%

*P < 0.05.
Multilevel logistic regression¹ Model 1: includes all variables found to be significant in univariate analysis. ² 2006 index of relative socio-economic advantage/disadvantage, ³ Standard error, ⁴ Explained ‘between practice variance using the variance in the empty model as reference.