Table 6. Confirmatory factor analysis results of the risk perception scale based on different factor structures.

Model	χ2	df	χ2/df	AIC	BIC	TLI	CFI	RMSEA
1	975.06	104	9.38	30,402.08	30,616.15	0.752	0.785	0.114
2A	670.65	103	6.51	30,099.67	30,318.20	0.837	0.860	0.093
2B	686.118	103	6.66	30,115.14	30,333.67	0.832	0.856	0.094
2C	720.981	103	7.00	30,150.00	30,368.54	0.822	0.847	0.097
3	406.65	101	4.03	29,839.66	30,067.12	0.910	0.925	0.069

Numbers listed in the column Model indicated the numbers of factors in the model. Two-factor model had three possible combinations. The model 2A consisted of factor 1 (treatment risks in study 1) and factor 2 (combination of burden risk factors and stigma risks in study 1). The model 2B consisted of factor 1 (combination of treatment risks and burden risks in study 1) and factor 2 (stigma risks in study 1). The model 2C consisted of factor 1 (combination of treatment risks and stigma risks in study 1) and factor 2 (burden risks in study 1). AIC, Akaike information criterion; BIC, Bayesian information criterion; TLI, Tucker-Lewis index; CFI, comparative fit index; RMSEA, root-mean-square error of approximation.