Comparatively analysing the postoperative optical performance of different intraocular lenses: a prospective observational study

Table 3 Post hoc testing and multiple comparisons analysis of BCDVA and the OQAS optical metrics

	Mon vs. SegRef				Mon vs. Dif				Mon vs. EDof				SegRef vs. Dif				SegRef vs. EDof				Dif vs. EDof			Total
	Test statistic		P	Test statistic			P	Test statistic			P	Test statistic			P	Test statistic			P	Test statistic			P	K/F	P
BCDVA^a	There was no statistical difference among the four groups, and no multiple comparisons results were outputted from the SPSS software																							7.439	0.059
PVA 100%^a	-39.979	< 0.001 *******			-19.669	0.105			0.463	1.000			20.310	0.079			40.442	< 0.001 *******			20.132	0.078		30.962	< 0.001 *******
PVA 20%^a	-35.517	< 0.001 *******			-19.455	0.111			0.101	1.000			16.063	0.295			35.618	< 0.001 *******			19.556	0.093		24.910	< 0.001 *******
PVA 9%^a	-26.878	0.009 **			-18.200	0.152			2.311	1.000			8.679	1.000			29.189	0.002 **			20.511	0.060		17.537	0.001 *******
SR^a	34.660	< 0.001 *******			21.534	0.058			8.654	1.000			-13.126	0.665			-26.006	0.012 *			-12.881	0.683		18.812	< 0.001 *******
OSI^a	-41.142	< 0.001 *******			-31.976	0.001 *******			-7.024	1.000			9.166	1.000			34.118	< 0.001 *******			24.952	0.013 *		32.257	< 0.001 *******
MTF cut-off frequency^b	14.478	< 0.001 *******			7.411	0.084			0.904	0.999			-7.067	0.036 *			-13.573	< 0.001 *******			-6.507	0.108		13.782	< 0.001 *******

^aNonnormally distributed data were compared by the Kruskal‒Wallis H test, and multiple comparisons were performed using the Bonferroni correction
^bNormally distributed data were compared by analysis of variance (ANOVA): the least significant difference (LSD) t test was applied when the assumption of homogeneity of variance was satisfied; otherwise, Tamhane’s T2 test was used
Mon = monofocal IOLs; SegRef = segmental refractive IOLs; Dif = diffractive IOLs; EDoF = extended depth of focus IOLs; BCDVA = best corrected distance visual acuity; PVA 100% = predicted visual acuity at contrast of 100%; PVA 20% = predicted visual acuity at contrast of 20%; PVA 9% = predicted visual acuity at contrast of 9%; SR = strehl ratio; MTF = Modulation transfer function; OSI = objective scattering index
*P < 0.05, **P ≤ 0.01; ***P ≤ 0.001

ISSN: 1471-2415