The time at risk was either from the 1st of January 1995 or the date of enrolment for dogs enrolled after that date until the dog died or became censored (not later than 31st of December year 2000).
There is no limitation on the number of generic component sessions attended within six months from the date of enrolment, but the disease-specific sessions were limited to two sessions for each enrolled patient.
In America only 57% of doctoral students will have a PhD ten years after their first date of enrolment.
The trial was registered at ClinicalTrials.gov, URL: https://clinicaltrials.gov/, number: NCT02157246, date of registration: 10 October 2013, date of enrolment of first participant: 20 Dec 2013.
An intermediate mechanism for physical identification of the soldiers, and their origin, date of enrolment, and unit was also called for (VII(c)).
Person time at risk for anaemia and malaria was calculated by subtracting the date of enrolment from the date of exit from the study.
Observation time was calculated from date of enrolment to study end date except where there was loss to follow up, diagnosis of TB, consent withdrawal or death.
Follow-up visits were conducted at the study clinic every three months for 12 or 30 months depending on the woman's date of enrolment.
Person time at risk was expressed in years (Person Years at Risk, PYAR) and was defined as date of exit from the study minus date of enrolment into the study.
For the analysis of the effect of IPTc on the incidence of malaria and anaemia, we calculated person time at risk from the date of enrolment to date of the final cross sectional survey (6 months after the start of intervention).
