. Author manuscript; available in PMC: 2017 Nov 1.

Published in final edited form as: Otolaryngol Head Neck Surg. 2017 Jul 11;157(5):760–766. doi: 10.1177/0194599817717674

Table 4.

Correlation of Preoperative VA and Time to Surgery with Postoperative Gain in VA Based on Calculated Cutoffs from ROC Analysis.

Variable	Correlation with VA Improvement >1 logMAR, R (P Value)
Preoperative VA, ≥1.52 logMAR	0.4887 (<.0001)^a
Time to surgery, <6 d	0.297 (<.0001)^b

Abbreviations: logMAR, logarithm of the minimum angle of resolution; ROC, receiver operator curve; VA, visual acuity.

Pearson correlation used given the linear relationship of interval data.

Spearman correlation used given the nonlinear relationship of interval data.