Model V is also the 'best fit' model for both time period, with a difference in –2ll from the first model of 46.913 for last year and 75.538 for the 5 year period. Thus indicating that the addition of variables provide an improvement in the predictive power of multiple partnerships for both time frames. Changes in the Model Chi-square for each new block added in the models were significant at the 0.0005 level, showing improvement in chi-square for each additional degree of freedom.