The researchers found that outcomes were similar in the OMT group and comparison group
in both countries.
Specifically, when preintervention trends are not parallel between treatment and comparison groups
, researchers worry that treatment assignment will be correlated with future outcome trends.
This study included 22,919 RVO patients and two comparison groups
(each with 114595 non-RVOs).
We used a large community sample as the comparison group
, which was drawn from the 1st, 5th, and 10th grades of 3 government schools in Baku city.
The significance of the difference between the groups was assessed by Student's t-test (two tailed, independent) to find the significance of the study parameters between the cases and the comparison groups
In our main analyses, we compare unmarried women ages 21-49 that have a high school education or less and live with children (target group) to two alternative comparison groups
: (1) unmarried women with no children in the same age and education groups, and (2) married mothers in the same age and education groups.
The comparison group
consisted of a pool of seven countries (Cameroon, Congo, Ethiopia, Gabon, Mozambique, Nigeria and Tanzania) that did not change their delivery fee policies.
However, Aboriginal CRF patients had lower SBA GMT compared to the Aboriginal healthy comparison group
. Overall, CRF patients had a lower SBA GMT than all healthy comparison groups
The intervention and comparison groups
were randomly formed, respecting the natural grouping of the classrooms.
Among women, 20 who took B vitamins and 9 in the comparison groups
developed cancer, a difference of borderline significance.
The central, peripheral, and comparison groups
each had only one member who committed what is categorized as a non-violent crime.