Among the 224 patients whose parents or guardians refused enrolment, we collected data only from 48 patients screened since December 2008.
149 patients gave other reasons for not participating, and 1374 patients gave no reason for refusing enrolment (patients could name more than one reason).
At least five CAPRISA 004 participant identification numbers were randomly drawn from the list of scheduled participants to accommodate the possibility of participants refusing enrolment or missing their appointment.
38 There were some differences in risk characteristics between the participants included in our analysis versus those who refused enrolment or were lost to follow-up after their baseline visit, but we think it unlikely that these differences introduced systematic bias into our findings pertaining to sex differences.
The identification of the main causes that lead women to participate to newborn cohort studies, to refuse the enrolment or to withdraw the consent during follow up allow researchers to develop strategies to minimize losses.
This study, carried out in women contacted or enrolled in a birth cohort study, made it possible to draw a complete picture of motivation that lead women to participate, to refuse the enrolment or to withdraw the consent during follow up.
The Los Angeles Times reported: "Among other things, they blocked expansion of Medicaid coverage for the poor, erected barriers to enrolment and refused to move health plans into the Obamacare marketplaces, a key step to brining in healthier consumers.
Fourteen individuals died before enrolment in the study, and 92 refused to participate.
More than 99.9% of all babies born at the sites were recruited for enrolment, and 1.3% of their parents refused participation.
Ninety-two parefusednto refused to participate and 14 participants died before enrolment, resulting in a study population of 599 participants at the age of 85 years (response rate 87%).
