Is there a lack of direct logical connection between the premise and the hypothesis? Premise: Consider a series of studies that examined length of maternity leave in relation to employed mothers' psychological well-being and parenting behaviors. Hypothesis: The study revealed that  the shorter the maternity leave, the worse the mental health.
Consider a series of studies that examined length of maternity leave in relation to employed mothers' psychological well-being and parenting behaviors.###The study revealed that  the shorter the maternity leave, the worse the mental health.