A Cox Proportional Hazard Model Approach to Age at First Sexual Intercourse in Nigeria
- 1 Department of Statistics, Federal University of Technology, Owerri, Nigeria
- 2 Department of Statistics, Federal University of Technology, Owerri, Nigeria
- 3 Department of Statistics, Federal University of Technology, Owerri, Nigeria
- 4 Department of Mathematics and Statistics, University of Port Harcourt, Port Harcourt, Nigeria
- 5 Department of Mathematics and Statistics, University of Port Harcourt, Port Harcourt, Nigeria
Abstract
Early age at first sexual intercourse comes with many negative sexual outcomes namely: having unprotected sex on first sexual intercourse, condom misuse, high rate of sexual ly transmitted infections (STIs), teenage pregnancy, increased numbe r of sexual partners, etc. In this paper, we considered some socio-demographic and cultural factors and their relationship with age at first sexual intercourse so as to reduce the numerous negative sexual outcomes of early age at first sex ual intercourse using the 2018 Nigerian Demographic and Health Survey data. The analysis was made using the Cox proportional hazard model and the Kaplan - Meier plot. The result shows that some respondents started having their first sexual intercourse at the age of 8 years and about 54.4% of the respondents had their first sexual intercourse before age 17 years. The median age of first sexual intercourse is 16 years which implies that about 50% of the respondents had their first sexual intercourse on or before their 16 th birthday. Education, religion, region and residence significantly affects the age of first sexual intercourse while circumcision has no significant effect.
- Jokin, D.I., Alfonso, O., Silvia, C., Miguel, R. and Cristiana, L.B. (2011) Mean Age of First Sex: Do They Know What We Mean? Archives of Sexual Behavior, 40, 853-855. https://doi.org/10.1007/s10508-011-9779-4
- Upchurch, D.M., Mason, W.M., Kusunoki, Y. and Kriechbaum, M.J. (2004) Social and Behavioral Determinants of Self-Reported STD among Adolescents. Perspectives on Sexual and Reproductive Health, 36, 276-287. https://doi.org/10.1363/3627604
- Campbell, A. (2008) The Morning after the Night before: Affective Reactions to One-Night Stands among Mated and Unmated Women and Men. Human Nature, 19, 157-173. https://doi.org/10.1007/s12110-008-9036-2
- Ma, Q., Ono-Kihara, M., Cong, L., Xu, G., Pan, X. and Zamani, S. (2009) Early Initiation of Sexual Activity: A Risk Factor for Sexually Transmitted Diseases, HIV Infection, and Unwanted Pregnancy among University Students in China. BMC Public Health, 9, Article No. 111. https://doi.org/10.1186/1471-2458-9-111
- Louie, K.S., De Sanjose, S., Diaz, M., Castellsague, X., Herrero, R. and Meijer, C.J. (2009) Early Age at First Sexual Intercourse and Early Pregnancy Are Risk Factors for Cervical Cancer in Developing Countries British. Journal of Cancer, 100, 1191-1197. https://doi.org/10.1038/sj.bjc.6604974
- Ugwuanyim, G.U., Osuchukwu, C.O., Bartholomew, D.C. and Obite, C.P. (2020) Medical Choices for a Wealthy Nation: A Multinomial Logistic Model. Asian Journal of Probability and Statistics, 6, 1-12. https://doi.org/10.9734/ajpas/2020/v6i330160
- Mercer, C.H., Aicken, C.R., Tanton, C., Estcourt, C.S., Brook, M.G., Keane, F. and Cassell, J.A. (2013) Serial Monogamy and Biologic Concurrency: Measurement of the Gaps between Sexual Partners to Inform Targeted Strategies. American Journal of Epidemiology, 178, 249-259. https://doi.org/10.1093/aje/kws467
- Anne, B. (2009) Age at Sexual Debut in South Africa. African Journal of AIDS Research, 4, 1-5.
- Laura, D.L., Isaac, M. and Arik, V.M. (2019) Prevalence of Sexual Initiation before Age 13 Years among Male Adolescents and Young Adults in the United States. JAMA Pediatrics, 173, 553-560. https://doi.org/10.1001/jamapediatrics.2019.0458
- Kann, L., McManus, T. and Harris, W.A. (2016) Youth Risk Behavior Surveillance: United States, 2015. MMWR Surveillance Summaries, 65, 1-174. https://doi.org/10.15585/mmwr.ss6506a1
- Warner, T.D. and Settersten, R.A. (2017) Why Neighborhoods (And How We Study Them) Matter for Adolescent Development. In: Benson, J.B., Ed., Advances in Child Development and Behavior, Vol. 52, Elsevier Academic Press, Amsterdam, 105-152. https://doi.org/10.1016/bs.acdb.2016.10.003