1.   A retrospective study showed that amiodarone was associated with a better prognosis in patients with documented ventricular tachycardia on electrocardiographic monitoring.

2.   This is a retrospective study.

3.   It was not possible, however, to obtain such data in this retrospective study.

4.   Despite several retrospective studies suggesting no association, some obstetricians still argue against performing induced abortions on the grounds of adverse outcome on future fertility.

5.   In retrospective studies, doctors have noticed that most children with asthma began wheezing in the first three years of life.

6.   Kristal said the retrospective study design and analysis was carefully crafted to protect against study subjects misreporting past dietary practices.

7.   Retrospective studies done decades later determined the source of that illness to be the hepatitis E virus.

8.   These are retrospective studies that focus on medical histories.

9.   Akhmedkhanov said his was the first to begin with healthy participants who were followed over time, a research method considered more accurate than a retrospective study.

10.   Akhmedkhanov said his study was the first to begin with healthy participants who were followed over time, a research method considered more accurate than a retrospective study.