In a study that aimed to assess the association between oral contraceptive failure rates and oral antibiotics 356 women with periodontal disease and 263 women without periodontal disease were followed during their pregnancy to assess whether or not they had pre-term deliveries.
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Get it written →In a study that aimed to assess the association between oral contraceptive failure rates and oral antibiotics 356 women with periodontal disease and 263 women without periodontal disease were followed during their pregnancy to assess whether or not they had pre-term deliveries.
This is an example of:
A) Cross-sectional study
B) Prospective cohort study
C) Retrospective cohort study
D) Clinical trial
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