Long-term maintenance of increased exercise involvement following a self-management intervention for housebound older adults with arthritis

Nour, Kareen; Laforest, Sophie; Gauvin, Lise; Gignac, Monique

doi:10.1186/1479-5868-4-22

International Journal of Behavioral Nutrition and Physical Activity

Table 3 Hierarchical Linear Models Analyses Predicting Exercise Change and Maintenance following the Intervention

From: Long-term maintenance of increased exercise involvement following a self-management intervention for housebound older adults with arthritis

		Baseline			Pre-intervention			Post-intervention 1				Post-intervention 2
Within-Subject Fixed Effects		γ_ij	Coeff.	SE	γ_ij	Coeff.	SE	γ_ij	Coeff.	SE	p	γ_ij	Coeff.	SE	p ^a
Variety of exercises	Intercept	γ₀₀	.51	.04	γ₁₀	-.14	.05	γ₂₀	-.10	.05	.08	γ₃₀	-.10	.05	.12
	Group	γ₀₁	-.03	.06	γ₁₁	.13	.06	γ₂₁	.24	.06	.00	γ₃₁	.22	.07	.00
Occurrence of exercise	Intercept	γ₀₀	7.78	.83	γ₁₀	-3.00	.86	γ₂₀	-2.33	0.92	.01	γ₃₀	-2.31	1.02	.02
	Group	γ₀₁	-.97	1.10	γ₁₁	2.40	1.13	γ₂₁	5.23	1.19	.00	γ₃₁	2.54	1.30	.05
- stretching	Intercept	γ₀₀	3.12	.38	γ₁₀	-1.06	.42	γ₂₀	-.87	.45	.06	γ₃₀	-.45	.50	.37
	Group	γ₀₁	-.40	.50	γ₁₁	.76	.56	γ₂₁	2.63	.59	.00	γ₃₁	.44	.64	.50
- walking	Intercept	γ₀₀	2.67	.36	γ₁₀	-.90	.42	γ₂₀	-.99	.45	.03	γ₃₀	-1.12	.50	.03
	Group	γ₀₁	-.56	.48	γ₁₁	.79	.56	γ₂₁	1.35	.59	.02	γ₃₁	-1.59	.64	.01
- strengthening	Intercept	γ₀₀	2.00	.36	γ₁₀	-1.00	.39	γ₂₀	-.39	.41	.30	γ₃₀	-.69	.46	.14
	Group	γ₀₁	-0.01	.47	γ₁₁	1.09	.51	γ₂₁	.91	.53	.10	γ₃₁	.39	.59	.51

Statistical significance of coefficient γ₃₁ is indicative of maintenance effects using the following model:
Level 1 model: Outcome = β_0j + β_1jX₁ + β_2jX₂ + β_2jX₂+ r_ij
Level 2 model: T₁ β_0j= γ₀₀ + γ₀₁ Gr_j + u_oj
T₂ β_1j= γ₁₀ + γ₁₁ Gr_j
T₃ β_2j= γ₂₀ + γ₂₁ Gr_j
T₄ β_2j= γ₃₀ + γ₃₁ Gr_j
where i: 1 ....N individuals ; r_ij: level 1 error term ; γ_ij : coefficients for parameters ; u_oj: level-2 random effect ; β: coefficient ; Gr: group membership (1 = experimental, 0 = control) ; X₁: dummy variable (1 = pre-intervention, 0 = otherwise) ; X₂: dummy variable(1 = post-intervention-1, 0 = otherwise); X₃: dummy variable(1 = post-intervention-2, 0 = otherwise)
Meaning of Coefficients:
γ₀₀ = Predicted value in outcome variable at baseline for participants in control group
γ₀₁ Gr_j = Predicted difference in outcome variable at baseline for participants in experimental group
γ₁₀ = Predicted change in outcome variable from baseline to pre-intervention for participants in control group
γ₁₁ Gr_j = Predicted difference in change in outcome variable from baseline to pre-intervention for participants in experimental group
γ₂₀ = Predicted change in outcome variable from baseline to post-intervention1 for participants in control group
γ₂₁ Gr_j = Predicted difference in change in outcome variable from baseline to post-intervention-1 for participants in experimental group
γ₃₀ = Predicted change in outcome variable from baseline to post-intervention-2 for participants in control
γ₃₁ Gr_j = Predicted difference in change in outcome variable from baseline to post-intervention-2 for participants in experimental group.
^asignificance of the changes that had occurred between post-intervention-1 and post-intervention-2

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ISSN: 1479-5868

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