Determination of the time of refractive stability after uneventful phacoemulsification in Indian eyes

Table 3 Refractive stability by age distribution

Parameters	1-wk post-operative			6-wk post-operative			P value1	P value2	P value3
	Age in yr			Age in yr
	< 55	55-65	> 65	< 55	55-65	> 65
Sphere							0.392	0.451	> 0.99
mean ± SD	-0.05 ± 0.4	0.1 ± 0.4	0.01 ± 0.4	-0.12 ± 0.3	0.03 ± 0.4	0.04 ± 0.3
Median (IQR)	0 (0-0)	0 (0-0)	0 (0-0)	0 (-0.5 to 0)	0 (0-0)	0 (0-0)
Range	-0.75 to 1	-0.8 to 1	-1.5 to 1	-0.75 to 0.75	-0.75 to 1.5	-0.5 to 1
Cylinder							0.769	0.408	0.717
mean ± SD	-0.6 ± 0.1	-0.2 ± 0.7	-0.3 ± 0.7	-0.5 ± 0.3	-0.1 ± 0.6	-0.4 ± 0.7
Median (IQR)	-0.5 (-0.75 to -0.5)	-0.5 (-0.5 to 0.5)	-0.5 (-0.75 to 0.5)	-0.5 (-0.5 to 0.5)	-0.5 (-0.5 to 0.5)	-0.5 (-0.75 to 0.5)
Range	-0.75 to 0.5	-3.5 to 1	-1.5 to 1.5	-1 to 0.5	-0.75 to 1.25	-1.5 to 1.5
Spherical equivalent							0.173	0.894	0.249
mean ± SD	-0.1 ± 0.4	-0.01 ± 0.4	-0.1 ± 0.4	-0.2 ± 0.3	-0.01 ± 0.4	-0.1 ± 0.3
Median (IQR)	0 (-0.37 to 0)	0 (-0.25 –0.25)	0 (-0.25 –0)	0 (-0.31– 0)	0 (-0.25 –0.25)	0 (-0.25 –0)
Range	-0.87 to 1	-1.75 to 1	-1.5 to 1.37	-1 to 0.5	-1 to 1.75	-1 to 0.87
P value4	0.358			0.287			-
P value5	0.052			0.013
P value6	0.246			0.057

¹Wilcoxon Sign rank test to compare the patients with age < 55 yr between 1^st wk and 6^th wk post-operative.

²Wilcoxon Sign rank test to compare the patients with age 55 yr to 65 yr between 1^st wk and 6^th wk post-operative.

³Wilcoxon Sign rank test to compare the patients with age > 65 yr between 1^st wk and 6^th wk post-operative. Boldface indicates statistical significance.

⁴Kruskal-Wallis test for comparing age and spherical power.

⁵Kruskal-Wallis test for comparing age and cylindrical power.

⁶Kruskal-Wallis test for comparing age and spherical equivalent.

IQR: Interquartile range.