. Author manuscript; available in PMC: 2019 Mar 1.

Published in final edited form as: Arthritis Care Res (Hoboken). 2018 Feb 6;70(3):333–342. doi: 10.1002/acr.23278

Table 5.

Adjusted Regression Models of the Associations between Subcutaneous Adipose Tissue (area in square cm), and Measures of Physical Function, and Physical Activity.

Dependent Variable	Step	Confounder Variable	Independent Variable	Beta Coefficient	R²	R² Δ	R² Adjusted	F- change	p- value

Strength (sqrt)	1	Age		.112	.788		.772	51.025	<.001
		BMI		−.567^*
		Gender		.084
		Area		1.143^*
	2		SAT	.305^*	.811	.023	.793	6.497	.014

Stair Climb (Inverse)	1	Age		−.303^*	.619		.591	22.349	.000
		BMI		−.809^*
		Gender		.221
		Area	SAT	.615^*
	2			.086	.621	.002	.586	.256	.615

Gait Speed	1	Age		−.262^*	.213		.170	4.973	.004
		BMI		−.605^*
	2	Gender		−.054
			SAT	.239	.227	.014	.170	.985	.325

Single Leg Stance	1	Age		−.333^*	.288		.236	5.557	.001
		BMI		−.595^*
		Gender		.029
		Area		.303
	2		SAT	.237	.302	.014	.237	1.060	.308

Chair Rise Time (Inverse)	1	Age		−.254^*	.240		.198	5.685	.002
		BMI		−.356
	2	Gender		.232
			SAT	−.041	.240	.000	.183	.030	.864

HAQ	1	BMI		.894^*	.133		.102	4.311	.018
	2	Gender		.361^*
			SAT	−.718^*	.260	.127	.220	9.433	.003

Physical Activity (Sqrt)	1	Age		−.333^*	.324		.280	7.497	.000
		BMI		−.657^*
	2	Gender		−.408^*
			SAT	.286	.344	.020	.287	1.408	.241

significant at alpha level 0.05

SAT: Subcutaneous Adipose Tissue, BMI: Body Mass Index, Quad: Quadriceps muscle, HAQ: Health Assessment Questionnaire, Sqrt: Square root transformed