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. 2007 Mar 6;5(3):e62. doi: 10.1371/journal.pbio.0050062

Figure 2. Effect of vitellogenin Gene Activity on Age at Foraging Onset.

Figure 2

Cumulative hazard increases until all bees have foraged. Knockdowns (vgRNAi) initiated foraging behavior earlier in life than injected controls (injGFP; LRT = 8.81, df = 1, p < 0.003, hazard ratio [comparative risk of initiating foraging calculated over the entire time of the study] = 1.43 d earlier, confidence interval = 1.13–1.81 d). A documented effect of laboratory handling [13,14] is shown by the injected controls foraging earlier than the non-injected reference (noREF) workers (LRT = 44.0, df = 1, p < 0.0001, hazard ratio = 1.97 d earlier, confidence interval = 1.62–2.39 d).