Reproductive parameters in Bossou group chimpanzees during 32 years (1976-2008)
Reproductive parameters	N	Mean	SD	Range	Study pereod	source
Age at first maximal swelling*1 (yrs.)	5	7.6	0.4	7.1-8.3	1976-2001	[77]
Age at first birth (yrs.)	5	10.9	1.8	9.7-13.9
Age of emigration from natal group*1(yrs.)	no data
Mean birth rate between 9-41 yrs. per year (all)	170 female-years	0.19
(> 4 yrs. survival of previous offspring)		0.17
Interbirth interval (yr.) 　　                                 (all)	22 mother-offspring pairs	4.6
(> 4 yrs. survival of previous offspring)	17mother-offspring pairs	5.3	2.3
The number of live birth during lifetime*2		4.25
The age at final birth (yrs.)				-41
Age at first maximal swelling*1 (yrs.)	5	7.6	0.4	7.1-8.3	1976-2008	[89]
Age at first birth (yrs.)	6	10.6		9.5-13
Age of emigration from natal group*1(yrs.)	3	9.0	1.0	8-10
Mean birth rate between 9-46 yrs. per year (all)		0.15
(> 4 yrs. survival of previous offspring)		0.11
Interbirth interval (yr.) 　　                                 (all)	24 births	4.5
(> 4 yrs. survival of previous offspring)	18 births	5.2
The number of live birth during lifetime*2		2.94
The age at final birth (yrs.)				-51
*1 The four parameter are related to the age at first birth.
*2 These were calculated from other sevral parameters.
Source:
[77] Sugiyama Y. (2004) Demographic parameters and life history of chimpanzees at Bossou, Guinea. Am. J. Phys. Anthropol. 124: 154-165
[89]Sugiyama Y. & Fujita S. (2011) The demography and reproductive parameters of Bossou chimpanzees. In: Matsuzawa T., Humle T. & Sugiyama Y. (eds.) The Chimpanzees of Bossou and Nimba. Springer, pp. 23-34