. Author manuscript; available in PMC: 2014 May 1.

Published in final edited form as: Am J Phys Med Rehabil. 2013 May;92(5):430–438. doi: 10.1097/PHM.0b013e31828763a0

Table 6.

Hierarchical regression analyses for walking endurance (A) and steps taken per day (B)

A. Walking Endurance	R	R²	R² Change	Significance of F Change	B (CI)
Block 1 Age
Sex
Race	0.573	0.329	0.329	7.972 (p=0.0001)	−1.723 (−4.631 to 1.185)
Block 2 Back extensor	0.696	0.485	0.157	14.624 (p=0.0001)	3.221 (1.527 to 4.194)
strength
Block 3 Pain severity	0.696	0.485	0.000	0.001 (p=0.982)	.005 (−.426 to .436)
Block 4 BMI	0.727	0.528	0.043	4.226 (p=0.046)	−.219 (−.433 to −.005)

Each block includes the listed variables and the addition of each previous block, and represents a separate regression equation. B (CI) = unstandardized B coefficient and confidence interval

B. Steps Taken Per Day	R	R²	R² Change	Significance of F Change	B (CI)

Block 1 Age
Sex
Race	0.389	0.151	0.151	2.791 (p=0.051)	−678.8 (−2007.6 to 649.9)
Block 2 Back extensor	0.398	0.159	0.007	0.047 (p=0.526)	284.6 (−612.8 to 1182.1)
strength
Block 3 Pain severity	0.405	0.164	0.005	0.291 (p=0.592)	61.9 (−169.4 to 293.2)
Block 4 BMI	0.444	0.197	0.033	1.796 (p=0.187)	−76.6 (−191.7 to 38.6)

Each block includes the listed variables and the addition of each previous block, and represents a separate regression equation.

B (CI) = unstandardized B coefficient and confidence interval

Sex coded = 0 male, 1 female; Race coded 1 = Caucasian, 2 = African American, 3 = Hispanic, 4 = Asian