Of the 10 049 women enrolled in the cohort, serology results from enrolment specimens were obtained for 9951 women.
"We have a big student database where we collect everything about them, from enrolment to when they leave," she says.
Scores employ a sophisticated methodology that tracks individual students from enrolment to graduation, comparing qualifications upon entry with the award that a student receives at the end of their studies.
Based upon a sophisticated indexing methodology that tracks students from enrolment to graduation, qualifications upon entry are compared with the award that a student receives at the end of their studies.
Few studies have explored patient outcomes at 12 months from enrolment in a CHF.
Patients were followed for up to 6 months from enrolment or until death.
The number of patients who presented with injuries or other conditions that would likely exclude them from enrolment was 30%.
Inability to perform forced expiration manoeuvres, either pre-treatment or post-treatment, excluded any patient from enrolment.
Follow-up of study units from enrolment to study completion minimizes the risk of attrition bias (systematic differences between groups in withdrawals from a study/loss of samples).
The present paper describes the background and current rationale of the ELECTRA study and details the study design, from enrolment strategy to data collection methods to planned data analysis.
Of these, 21 were excluded from enrolment due to chronic illness, permanent disability or because they were severely malnourished.
