The study might, for example, compare two groups of patients given different doses.
But the future prognoses associated with those two groups of patients are quite different.
The two groups of patients have much in common.
In another investigation,90 simultaneous recordings of esophageal EMG and manometry were made in two groups of patients with scleroderma.
Design: Cross-sectional study comparing two groups of patients and a group of healthy controls.
Two groups of patients with an established diagnosis of alcohol dependence were compared.
Data from two groups of patients had been collected twice, at baseline and after 5 weeks.
In the two groups of patients that had taken the commonly used drugs, there had been 14 and 20 serious heart attacks.
The three-year project compared two groups of patients one year after their diagnosis, including those with a poor survival outcome and those resistant to cancer treatments.
Two groups of patients received either continuous ranitidine therapy (150 mg po b.i.d.) or continuous lansoprazole therapy (30 mg po qd).
Two groups of patients were compared.
