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Asked Dec 26, 2019

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In Exercises 29–32, indicate whether the observational study used is cross-sectional, retrospective, or prospective.

Nurses’ Health Study II Phase II of the Nurses’ Health Study was started in 1989 with 116,000 female registered nurses. The study is ongoing.

Step 1

**Cross sectional study:**

In the cross-sectional study, the data is collected at certain point of time.

**Retrospective study:**

In the retrospective study, the data is collected from the past time.

**Prospective study:**

In the prospective study, the data is collected by observing the events in future.

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