Table 3.

Hierarchical regression model for exposure hours using individual intensity indices

			Change statistics
Model	R	R2	R2 change	F change	Significant F change
1	0.335*	0.112	0.112	2.017	0.175
2	0.577†	0.333	0.221	4.977	0.041
3	0.581‡	0.337	0.004	0.083	0.778
4	0.583§	0.340	0.003	0.065	0.803

^*Predictors included in model 1: pallidal index.

^†Predictors included in model 2: pallidal index, caudate index.

^‡Predictors included in model 3: pallidal index, caudate index, anterior putamen index.

^§Predictors included in model 4: pallidal index, caudate index, anterior putamen index, posterior putamen index.