Table 2.

Unidimensionality and monotonicity of the self and proxy version of the TSC-PROM

	Self			Proxy
	Physical functions	Mental functions	Activities and participation	Physical functions	Mental functions	Activities and participation
Unidimensionality
CFA
CFI	0.90	0.97	0.97	0.88	0.90	0.96
TLI	0.89	0.97	0.97	0.86	0.90	0.95
RMSEA	0.07	0.06	0.11	0.08	0.08	0.12
Bi-factor model
ωh	0.59	0.72	0.75	0.53	0.67	0.72
ECV	0.53	0.60	0.64	0.40	0.53	0.58
Monotonicity
Hi	> 0.10	> 0.31	> 0.50	> 0.02	> 0.06	> 0.21
H	0.30	0.518	0.62	0.27	0.37	0.49

Values in bold indicate acceptable fit. Predefined criteria are provided (see Additional file 1)

CFA Confirmatory factor analysis, CFI Comparative fit index, ECV Explained common variance, RMSEA Root mean square error of approximation, TLI Tucker-Lewis index