Hierarchical Multiple regression - Relationship between cognitive test performance and walking time.

Hierarchical multiple linear regression with the cognitive tests scores as explained variables, age, education, gender, height and weight as explanatory variables: a- First: age, gender, education level, height and weight were forced into the model b- Then walking time was added to the model “a” c- Unique contribution of the walking time (R-squared of model b – model a), all p<0.0001.