13 Allocation of participants to treatment conditions was accomplished using a computer-generated randomisation sequence, determined from randomly permuted blocks of equal length with fixed numbers of treatment allotments to balance treatment enrolments over time.
"People change over time.
Thirdly, the other possible reason for increased TB- free survival within the duration of enrolment could be the result of progressive increase in CD4 cell count which builds the immune system and may decrease the viral load over time.
Figure 1 shows the percentage of study participants working at enrolment who continued working over time.
Variables were generated to examine the differential effect of recorded exposures over time (enrolment vs follow-up).
From MoEYS Education Management Information System Changes in Enrolments in State Preschools over Time Table 2.
Neither was there any difference in the percentage of optimal cytoreduction over time of enrolment, nor across the six operating teams (data not shown).
The 'FRAME-cohort' (Frederiksberg hospitals Rheumatoid Arthritis, pain assessment and Medical Evaluation) study will be designed as a 'closed cohort' with prospective enrolment of patients with RA over time.
"It is misleading to invoke early enrolment and completion figures as representative of the phenomenon," she writes, "six-figure enrolments are atypical, with the median average enrolment being 42,844 students, and decreasing over time as the number of courses available continues to increase".
In fact, several vendors strongly suggest to repeat enrolment sessions in order to collect, over time, a set of templates representative enough.
