TABLE 1.

Means and standard errors for ages and weights of non-human primate groups.

Rearing	N	Age (mean ± SE) (years)	Mass (mean ± SE) (kg)
VFD	12	14.77 ± 1.07a	5.80 ± 0.38b
Non-VFD	27	16.18 ± 0.73a	5.37 ± 0.26b

^aF_{1, 37} = 1.16, p = 0.28; ^bF_{1, 37} = 0.84, p = 0.36. VFD, variable foraging demand; SE, standard error.