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. 2020 Apr 29;10:7261. doi: 10.1038/s41598-020-64251-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Kaplan-Meier survival plots and cumulative probabilities of success at 3 postoperative years according to life-time analysis of all the subjects in this study as well as of the two groups of intermittent exotropia with convergence insufficiency according to their response to diagnostic monocular occlusion for 2 hours. The overall cumulative probability of surgical success at 3 postoperative years was 76%. Mean recurrence was 49.9 ± 2.5 months (95% confidence interval, 44.980–54.737) in all the subjects with intermittent exotropia with convergence insufficiency. Cumulative probabilities of surgical success at 3 postoperative years were 89% in the True-CI group and 55% in the Masked-CI group. Mean recurrence in the True CI group was 55.7 ± 2.0 months (95% confidence interval, 51.725–59.658), and that in the Masked CI group was 39.6 ± 5.0 months (95% confidence interval, 29.790–49.443). There was a statistically significant difference in survival curves between the two groups. (p = 0.0052, Log-rank test).