Comparative effectiveness research may stimulate heated debate, but ultimately, those who question its findings need to provide high-quality data to support their arguments ne consequence of the continuing rise in the cost of health care has been the emergence of comparative effectiveness research. 1 This variant of evidence-based medicine is defined as:. .. the generation and synthesis of evid...

Thirty-six 1-year-old middle-class children with fathers who spent differential time with them at home were observed in two experimental contexts separated by 2 weeks. In the first, each infant was shown six to eight repetitions of three different nonsocial events followed by a change in the repeated standard. In the second, each infant experienced the unannounced entrances and departures of hi...