preterm among those with a lowrisk
baseline profile, and a reduction from 18 to 7% preterm
among those with a high-risk baseline profile. While
inferences are limited by the incomplete range of available
predictors, uncertainty regarding whether observed associations
are causal, and substantial challenges in changing
component behaviors, the possibility of substantial
reduction in risk merits more serious consideration of
whether behavioral interventions could markedly reduce
the risk of preterm birth.