Table 2.

Mean age (years) at maturation milestones as calculated using Kaplan-Meier survival analysis (including censored intervals) in female chimpanzees of known age.

Milestone	n	Mean (yrs)	SE	Range*
Age at sexual maturity	36 (10 censored)	11.47	0.27	8.50–13.86
Age at emigration
All females	12 (0 censored)	12.26	0.54	10.38–15.44
Confirmed dispersers	8 (0 censored)	12.89	0.71	10.38–15.44
Age at first birth
All females	24 (5 censored)	14.90	0.65	11.11–22.08
Non-dispersing females	12 (0 censored)	13.72	0.59	11.11–17.25
Dispersing females	7 (0 censored)	16.21	1.35	11.21–22.08
Immigration to first birth	39 (6 censored)	3.75	0.39	0.55–8.16

^*Only includes completed intervals