Development of the Brief Ageing Perceptions Questionnaire (B-APQ): a confirmatory factor analysis approach to item reduction

Table 2 Model fit statistics at each step of model revision

Model	Description	Chi-Square	df	RMSEA	90% CI		CFI	TLI
	Step 1: Test established model
1.1	7 Factors, 32 items	10056.02	444	0.057	0.056	0.058	0.837	0.818
	Step 2: Remove Items
2.1	7 Factors, 21 items	1892.69	168	0.039	0.038	0.041	0.968	0.961
	Step 3: Combine sub-dimensions
3.1	6 Factors, 21 Items	6197.67	171	0.072	0.071	0.074	0.890	0.865
3.1	Consequence dimensions combined, Residual Covariances for Negative Items	6197.67	171	0.072	0.071	0.074	0.890	0.865
3.2	6 Factors, 21 Items	2593.06	171	0.046	0.044	0.047	0.956	0.946
3.2	Consequence dimensions combined, Residual Covariances for Positive Items	2593.06	171	0.046	0.044	0.047	0.956	0.946
3.3	6 Factors, 21 Items	4664.29	171	0.063	0.061	0.064	0.918	0.899
3.3	Control dimensions combined, Residual Covariances for Negative Items	4664.29	171	0.063	0.061	0.064	0.918	0.899
3.4	6 Factors, 21 Items	2532.91	171	0.045	0.044	0.047	0.957	0.947
3.4	Control dimensions combined, Residual Covariances for Positive Items	2532.91	171	0.045	0.044	0.047	0.957	0.947
3.5	6 Factors, 21 Items Negative Control and Consequence items combined	2920.59	174	0.048	0.047	0.050	0.950	0.939
3.6	6 Factors, 21 Items Positive Control and Consequence items combined	6423.66	174	0.073	0.072	0.075	0.886	0.862
3.7	6 Factors, 20 items	1882.74	155	0.041	0.039	0.042	0.967	0.959
3.7	Model 3.5 with Item 22 removed	1882.74	155	0.041	0.039	0.042	0.967	0.959
	Step 4: Remove Sub-dimensions
4.1	5 Factors, 17 items	1433.54	109	0.043	0.041	0.045	0.968	0.960
4.1	Model 3.7 with Timeline-Cyclical Removed	1433.54	109	0.043	0.041	0.045	0.968	0.960

Legend: RMSEA = Root Mean Square Error of Approximation; TLI = Tucker-Lewis Index; CFI = Comparative Fit Index.

ISSN: 1471-2318