Appendix 1. Confirmatory Factor Analysis Model Comparison Based on a Likelihood Ratio Chi-Square, the Number of Parameters Estimated, and the Following Information Criteria Indices: Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC) and Sample-Size Adjusted BIC. Lower Information Values Indicate Better Model Fit

		Akaike (AIC)	Bayesian (BIC)	Sample-Size Adjusted BIC	Loglikelihood	Number of Parameters Estimated
Participation restriction	Unidimensional	39,050.02	39,987.981	39,286.49	−19,304.010	221
	Two factor model	38,658.89	39,601.099	38,896.43	−19,107.447	222
	Bifactor with one subfactor: Instrumental roles	38,554.71	39,607.268	38,820.07	−19,029.357	247
	Bifactor with one subfactor: social roles	38,530.54	39,578.848	38,794.83	−19,018.269	248
	Bifactor with two subfactors	37,913.16	39,080.305	38,207.41	−18,681.579	275
Activity limitation	Unidimensional	78,569.09	80,371.897	79,026.03	−38,860.545	424
	Two factor model	77,410.57	79,217.631	77,868.59	−38,280.286	425
	Bifactor with one subfactor: basic mobility & handling	76,279.14	78,345.562	76,802.90	−37,653.569	486
	Bifactor with one subfactor: daily activities	77,181.09	79,166.725	77,684.37	−38,123.543	467
	Bifactor with two subfactors	75,844.06	78,097.566	76,415.24	−37,392.028	530