Table 2. Comparison of preoperative and postoperative parameters and postoperative differences between ERM eyes and fellow eyes (control).

Parameters	ERM (n=63)	Control (n=63)	P-valuea	Ratio P-valueb
AUV (number of pixels)				<0.001*
Preoperative	16476.1±3202.1	18181.2±3121.0	<0.001*
Postoperative	17358.2±3457.6	18128.8±3555.9	0.152
ΔAUV	882.2±1785.2	−52.4±1603.3	0.001*
P-valuea	<0.001*	0.796
MDA (degree)				<0.001*
Preoperative	73.4±11.2	76.5±8.1	0.053
Postoperative	76.1±10.6	76.5±7.6	0.781
ΔMDA	2.7±2.9	0.0±2.6	<0.001*
P-valuea	<0.001*	0.969

Abbreviations: AUV, area under major vessels; ERM, epiretinal membrane; MDA, macroscopic diverging angle.

All values are given as mean±s.d.; number of pixels=pixel × pixel; ΔAUV=postoperative AUV−preoperative AUV; ΔMDA=postoperative MDA−preoperative MDA.

^aP-value by paired t-test.

^bP-value by ratio paired t-test of the logarithmic value of (postoperative/preoperative) ratio between both eyes.

^*P-value <0.05.