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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: Vision Res. 2015 Feb 7;114:87–99. doi: 10.1016/j.visres.2015.01.016

Table 3a.

Results of the mediation analysis: Effect of amplitude of microsaccades on visual acuity through fixation stability. a represents the effect of amplitude of microsaccades on fixation stability; b represents the effect of fixation stability on visual acuity and c represents the direct effect of amplitude of microsaccades on visual acuity.

Estimate SE z value p-value 95% lower percentile CI 95% CI upper percentile
Direct effect (c) −0.032 0.199 −0.163 0.870
a 1.271 0.446 2.854 0.004
b 0.434 0.168 2.590 0.010
Indirect effect (a * b) 0.552 0.220 2.506 0.012 0.155 1.041
Total (c + a * b) 0.520 0.207 2.505 0.012 0.107 0.942
Ratio of indirect to total effects 1.062 3.122 0.340 0.271 0.408 2.465

The 95% CIs are obtained by bootstrap with 10,000 resamples.