《Table 1 Description of studies》

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《Comparison of bilateral/unilateral lateral rectus recession and unilateral recession-resection for intermittent exotropia:a Meta-analysis》

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RCT:Random control trial；BLR:Bilateral lateral rectus recession；R&R:Unilateral lateral rectus recession combined with medial rectus resection；ULR:Unilateral lateral rectus recession；D:Distance；N:Near；NN:Not note；PD:Prism diopter；O:Overcorrection；S:Success

In the two studies，the type of IX（T）included both basic and true divergence excess，of which，the later one was very little，only two true divergence excess IX（T）are in Kim et al’s[17]study.Analysis results show that the ULR and R&R were equivalent to some extent in term of success rate（OR=0.82，95%CI 0.36，1.89）.The mean duration of follow-up of more than 2y and a same follow-up period of more than 3y are for all the 3 trials involved.In addition，it is also found that the heterogeneity of outcome is evident（I2=74%，P=0.65），and such heterogeneity was not affected by the factor of age.In the subgroup analysis concentrating on the angle of preoperative deviation，it is found that in both studies by Suh et al[18]and Kim et al[19]，the preoperative angle of exodeviation was between 20 PD and25 PD（moderate angle exotropia）；moreover，the pooled result was consistent with that of previous one（OR=1.08，95%CI0.65，1.79）.In Kim et al’s[17]study，a total of 130 children withIX（T）of≤20 PD（small angle exotropia）were involved，and the results indicated that R&R has a better outcome than ULR（OR=0.37，95%CI 0.18，0.74；Table 2）.