One example could be the differences in the infant’s age and health during the study, the differences in the drug combinations used by the mothers, and the the methods used in obtaining a mother’s drug status. another factor could be that the sample sizes were too small to obtain a theory to be applied to the population as a
One example could be the differences in the infant’s age and health during the study, the differences in the drug combinations used by the mothers, and the the methods used in obtaining a mother’s drug status. another factor could be that the sample sizes were too small to obtain a theory to be applied to the population as a