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Chapter 6154Table 2. Unidimensionality and monotonicity of the self and proxy version of the TSC-PROM. Self ProxyPhysical functionsMental functionsActivities and participationPhysical functionsMental functionsActivities and participationUnidimensionalityCFACFI 0.90 0.97 0.97 0.88 0.90 0.96TLI 0.89 0.97 0.97 0.86 0.90 0.95RMSEA 0.07 0.06 0.11 0.08 0.08 0.12Bi-factor modelωh 0.59 0.72 0.75 0.53 0.67 0.72ECV 0.53 0.60 0.64 0.40 0.53 0.58MonotonicityHi >0.10 >0.31 >0.50 >0.02 >0.06 >0.21H 0.30 0.518 0.62 0.27 0.37 0.49Values 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. Internal consistency reliability For the self-report, the corrected item-total correlations ranged from 0.00 to 0.62 (physical functions domain), 0.39 to 0.82 (mental functions domain), 0.56 to 0.84 (activities and participation domain). For the proxy-report, it ranged from 0.00 to 0.72 (physical functions domain), 0.08 to 0.84 (mental functions domain), 0.23 to 0.82 (activities and participation domain). Cronbach’s alpha value of the total TSC-PROM score was 0.819 and 0.775 for the self and proxy-report, respectively, which met the threshold criterion range of 0.70-0.95. Cronbach’s alpha of each subscale ranged from 0.81 to 0.97 (Table 3). Table 3. Item-total correlations and internal consistency reliability of the TSC-PROM.Item-total correlations Cronbach’s alphaSelf-report Proxy-report Self-report Proxy-reportTotal TSC-PROM 0.819 0.775Physical functions domain 0.00-0.62 0.00-0.72 0.806 0.820Mental functions domain 0.39-0.82 0.08-0.84 0.967 0.924Activities and participation 0.56-0.84 0.23-0.82 0.938 0.906Annelieke Muller sHL.indd 154 14-11-2023 09:07