Final answer:
The passage discusses the example of health disparity in the United States, but does not provide the problem statement or the purpose of the study.
Step-by-step explanation:
The research topic of this passage is health disparity. Health disparity refers to the unequal distribution of health outcomes or access to healthcare services among different populations. In this passage, the example of health disparity is mentioned in the context of the United States.
The problem statement is not explicitly provided in the passage. However, the significance of the problem can be inferred from the mention of health disparity. Health disparities can have major societal implications and can contribute to healthcare inequalities.
The purpose of the study is not stated in the passage.