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Researchers recruit 220 pregnant women who are overweight. The researchers randomly assign half of the women to walk daily for at least 45 mins during
Researchers recruit 220 pregnant women who are overweight. The researchers randomly assign half of the women to walk daily for at least 45 mins during their first trimester. The other half serve as a control group and do not change their daily exercise routine. Each participant's glucose level (in mg/dL) is closely monitored by a physician weekly. Is this an observational or experimental study
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