highly significantp < 0.001
At 3 weeks, the effect of the group was not significant (F 2,69 = 0.50, p = 0.61), whereas the number of littermates had a highly significant effect (F 1,69 = 21.6, p < 0.001).
At 3 weeks, the effect of the group was not significant (F 2,69 = 0.50, p = 0.61), whereas the number of littermates had a highly significant effect (F 1,69 = 21.6, p < 0.001).