ISSN 2456-0235

International Journal of Modern Science and Technology


​​​​​​International Journal of Modern Science and Technology, Vol. 2, No. 9, 2017, Pages 322-327. 

Post-Partum Insusceptibility as a Proximate Determinant of Fertility amongst Abagusii of South West Kenya  

F. Onsongo
Department of Geography, Kenyatta University, P. O. Box 434401-00100, Nairobi, Kenya.
​​*Corresponding author’s e-mail:

Post-partum insusceptibility is the combined effect of lactational amenorrhea and post-partum sexual abstinence on fertility. Post-partum insusceptibility (PPI) is one of the five proximate determinants of fertility which relate total fertility to potential fertility in the Stover model (1998). The practice of breast-feeding influences post-partum amenorrhea while post-partum abstinence prevents conception, two crucial elements of the index of PPI. It is calculated as the average birth interval in the absence of breast-feeding, divided by the average length of the interval when breast-feeding takes place: Ci = 20/(18.5+i), where: i average duration of post-partum amenorrhea and post-partum abstinence. In this study, the value found was 0.63. From the recorded value and its comparison to other areas, it can be inferred that post-partum insusceptibility has a strong inhibiting effect on the fertility of the Abagusii women. Furthermore, the fact that the PPI index for Kisii had a value of 0.63 and the value for women’s sexuality was 0.698 indicates that PPI has a higher inhibiting effect than women’s sexuality in depressing the fertility of Abagusii women. This is because according to the Bongaarts model, the lower the value of the index, the higher the depressing effect.

Keywords: Post-Partum; Insusceptibility; Proximate; Determinant; Fertility Abagusii and Kenya. 


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