The effect of changes in intraocular pressure on the risk of primary open-angle glaucoma in patients with ocular hypertension: an application of latent class analysis

Table 6 Sensitivity analysis comparing the overall predictive accuracy (measured as C-index and Calibration Chi-square statistics) for LCAs with different model specifications

Model	Model Features	C index		Calibration Chi-square
		OHTS	EGPS	OHTS	EGPS
0	Cox mode with baseline factors only	0.778	0.706	5.0	2.1
1	LCA with a quadratic within-class functional form	0.821	0.719	11.3	7.0
2	LCA with a linear within-class functional form	0.825	0.720	10.2	4.9
3	LCA with a constant within-class functional form	0.823	0.727	10.5	13.5

ISSN: 1471-2288