It might be in the study of wage inequality, or labor supply responses to taxes, or whatever.
One explanation could be in the study designs and the different outcome measures used in the various studies.
Anyone who wants to take part must fit the guidelines to be in the study (called the inclusion and exclusion criteria).
So when they asked me to be in the study I thought it would be a good way to get information that might tell me something about my own health and the health of my child".
It took him five years to recruit the women, he said, adding that many refused to be in the study because they believed so strongly in the power of a support group to prolong their lives.
Although the two used many drugs, the research assistant who interviewed them by phone told them what not to admit to her if they wanted to be in the study, Greg said.
THE MUM: Kate Calver, 50, secondary school teacher Just before giving birth to Sophie, I was approached by the research team who asked me to be in the study.
According to the board, Abuzzahab had "enrolled psychiatrically disturbed and vulnerable patients into investigational drug studies without ensuring that they met eligibility criteria to be in the study and then kept them in the study after their conditions deteriorated".
To be in the study, a person had to have a first-degree relative who had had Alzheimer's, making it more likely that they would have an APO e4 variant.
"It was one of the hardest decisions I had to make to be in the study," said Ms. Shapiro, who knew how disabling spina bifida was because her sister-in-law has it.
"You will be in the study for a minimum of 12 months and the study will remain open for 18 months or until FDA clearance of Scanadu Scout," read a letter to customers.
