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Volume 1:
No. 4, October 2004
ORIGINAL RESEARCH
A Randomized Controlled
Open Trial of Population-based Disease and Case Management in a Medicare
Plus Choice Health Maintenance Organization
Figure.
Flow chart illustrating participant eligibility, exclusion, enrollment,
retention, survey participation, and attrition, including a comparison of
the intervention and control groups, throughout the randomized controlled
open trial.
This figure consists of a flowchart, which provides information on the
numbers of individuals who participated in the study from beginning to end.
It shows the number of individuals who were excluded from the study, how
many disenrolled or died during the study, and how many took part in the
three study surveys. In addition, the numbers are divided into two groups:
the intervention group and the control group.
On September 30, 1999, there were 13,304 eligible Advantra members. Of
these, a risk group of 1799 Advantra members was excluded from the study. Before
the study start date, another
3001 members disenrolled.
The number of continuously enrolled
members from January 1999 through December 1999 was 8504. The table below
compares the intervention group and control group at three points in time:
January 1, 2000, December 31, 2000, and June 30, 2001
| |
Intervention, n |
Control, n |
| Jan 1, 2000 |
| Participating |
4257 |
4247 |
| 1st survey respondents |
3137 (74%) |
3021 (71%) |
| Dec 31, 2000 |
| Deceased |
132 |
143 |
| Disenrolled |
383 |
311 |
| Participating |
3742 |
3793 |
| 2nd survey respondents |
2778 (74%) |
2699 (71%) |
| June 30, 2001 |
| Deceased |
191 |
211 |
| Disenrolled |
582 |
483 |
| Participating |
3484 |
3553 |
| 3rd Survey respondents |
2733 (78%) |
2650 (75%) |
| 1st & 3rd Survey respondents |
2271 (65%) |
2176 (61%) |
Table 1 presents results of the first survey, and Table 2 compares
results from the first and third surveys.
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