Days to pupation.

<p>Kaplan-Meier survival curves for matched pairs of Learning and Random subjects (<i>n</i> = 36). The data were analyzed using the standard statistic for Kaplan-Meier survival analysis, namely a Mantel-Cox log rank chi-square analysis. That analysis revealed that Learning antlions pupated in significantly less time than Random antlions, χ² (1, <i>N</i> = 36) = 7.66, <i>p</i><0.01. Following 70 days of treatment, 79% of Learning antlions pupated (15 of 19), while only 35% of Random antlions pupated (6 of 17). Median survival time, here median days to pupation, corresponding to the time point at which half of the animals remained (i.e., 50% cumulative survival), was 46 days for Learning antlions; median survival time was not reached in Random animals, even by the end of the experiment on Day 70.