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A recent study reported that of 4500 women who underwent dental X-rays during pregnancy, 1117 had low-birth-weight babies

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A recent study reported that of 4500 women who underwent dental X-rays during pregnancy, 1117 had low-birth-weight babies. The researchers concluded that women who have dental X-rays during pregnancy face an increased risk of having underweight babies. What questions might you want to ask about this research before accepting their conclusion?