Astigmatism in Treated vs Sample Clauses

Astigmatism in Treated vs. Fellow Eyes Information on astigmatism values in treated and fellow eyes is presented in Table 1. In both treated and fellow eyes, mean baseline astigmatism values were both slightly less than 2 diopters (1.99 for treated eyes, SD = 1.31 D; 1.93 for fellow eyes, SD = 1.08 D). Medians for these values were very similar to the means (1.755 for treated eyes; 1.90 for fellow eyes). The histograms for the baseline astigmatism values of the treated and fellow eyes are shown in Figures 1(a) and 1(d). These histograms show similar distributions of keratometric astigmatism values among treated and fellow eyes at baseline. The paired t-test between treated and fellow eyes indeed confirms that the average astigmatism for the two eyes was similar at baseline: the mean difference (treated eyes minus fellow eyes) is 0.06, with p = 0.632 (Table 1). Figures 1(b) and (e) show histograms for astigmatism values in treated and fellow eyes, respectively, at 1 year of age. Treated eyes have a mean keratometric astigmatism of 1.86 (median of 1.75) and standard deviation of 1.06, as seen in Table 1. Fellow eyes have a similar standard deviation as treated eyes, 0.95; however, the mean keratometric astigmatism of 1.42 and median of 1.25 are approximately 0.5 diopters less than that of treated eyes. There is a statistically significant difference in mean keratometric astigmatism values between treated and fellow eyes at 1 year of age (paired difference = 0.44; p-value = 0.0003). The distribution of the change between baseline and 1 year for aphakic and fellow eyes is shown by histograms in Figures 1(c) and (f), respectively. Scatter plots of individual baseline versus 1 year of age values are shown in Figures 2(a) and (b), for fellow and treated eyes, while values and 95% confidence intervals are found in Table 1. Treated eyes had a mean difference of -0.14 diopters (1 year minus baseline); the change was not significantly different from 0 (p = 0.362). Fellow eyes showed a difference of -0.49 diopters, however, a statistically significant departure from 0 (p = 0.0003). The paired difference between treated and fellow eyes is not significant when α = 0.05 (mean paired difference = 0.34, p-value = 0.062).
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