Results show that more census tracts exhibited an increasing trend than decreasing trend in birth outcomes and in several maternal characteristics for both races (gestational and chronic hypertension, gestational diabetes, and previous preterm birth).
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Using space-time cube to analyze trends in adverse birth outcomes and maternal characteristics in Massachusetts, USA.
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The sentences
Trends in cigarette use during pregnancy showed encouraging results—for both races, there were 4–5 times more tracts with a decreasing trend than with an increasing trend.