Reproductive parameter in Wamba forest 
Group Mean inter birth interval Mean interval between live births  
E1 group (1974-96) 4.8 years (n = 18) 5.2 years (n = 15)
E2 group (1976-89) 4.3 years (n = 14) 4.4 years (n = 13)
Toal 4.6 years (n = 32) 4.8 years (n = 28)
Source
[98] Furuichi T., Idani G., Ihobe H., Kuroda S., Kitamura K., Mori A., Enomoto T., Okayasu N., Hashimoto C. & Kano T. (1998) Population dynamics of wild bonobos (Pan paniscus) at Wamba. Int. J. Primatol. 19: 1029-1043