Data were entered, cleaned, analyzed using Epi info version 3.5.4. Male partner involvement was a composite measure that included partner testing for HIV, partner support and partner aware of Mother's PMTCT status. Partner aware of mother's HIV status (disclosure) was further evaluated for existence of any form of Gender Based Violence. All independent variables including partner's knowledge were factors perceived by the mother as the respondent. Marital status such cohabiting and married were codes as living together while single and divorce were coded as not living together. Further coding for marital status was married for married couple while cohabiting, divorce and single were coded as not married. Univariate and Bivariate were done. Odds Ratio (OR) was used to quantify the likelihood of Male partner involvement into PMTCT and statistical significance was assessed using P- value and 95% confidence intervals for the odds ratios (OR). All independent variables with P-value <0.2 in the Bivariate analysis were considered for multivariate analysis through logistic regression to assess the effect of each covariate in the final model. Step down procedure for logistic regression was used to identify variables associated with male partner involvement in the final model. Ethical clearance was obtained from the Research Ethics Committee of Muhimbili University of Health and Allied Sciences. At the local level permission was also sought from Mwanza region authority and the respective health facilities authority. A written consent was obtained from each participant before interview.