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. 2014 Jul 29;9(7):e103605. doi: 10.1371/journal.pone.0103605

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© 2014 Kobashi et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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WFG-PRK = wavefront guided photorefractive keratectomy, Non-WFG-PRK = non-wavefront guided photorefractive keratectomy, M-H = Mantel-Haenszel, CI = confidence interval, Chi² = chi-square statistic, df = degrees of freedom, I² = I-square heterogeneity statistic, Z = Z-statistic.