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The other hand, if exp(ej) is assumed to have a gamma distribution with a gamma function (), then the conditional probability function yj will be the negative binomial distribution as in Equation A4 below. yj ?-1 -1 -1 yj ? ?Pr yj xj ?; yj ! ?1 ?-1 ? -1 ? yj ?0; 1; 2......... 4?Equation A4 was used to estimate the intensity of use of antenatal visits in the count form.Competing interests Th