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. Author manuscript; available in PMC: 2010 Feb 1.
Published in final edited form as: J AAPOS. 2008 Nov 6;13(1):8–12. doi: 10.1016/j.jaapos.2008.06.013

Table 3.

Risk factors for requiring a second surgery among 126 patients with congenital esotropia

Risk factor Cox proportional hazard ratio (95% confidence interval) p-value
Family history of strabismus 0.76 (0.40–1.44) 0.40
Prematurity (gestational age <37 weeks) 1.53 (0.76–3.11) 0.24
Gestational age at birth (weeks) 0.93 (0.81–1.06) 0.28
Birth weight (per 1,000 g) 0.97 (0.64–1.47) 0.88
Age at diagnosis (per year of increasing age) 0.65 (0.37–1.15) 0.14
Amblyopia at presentation 1.31 (0.80–2.16) 0.28
Size of the angle at presentation (per increase of esotropia by 10Δ) 1.25(1.04–1.51) 0.017
Age at first surgery (per year of increasing age) 0.55 (0.36–0.84) 0.006
Inferior oblique overaction at initial examination 0.90 (0.36–2.26) 0.83