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Initial attrition was mainly because of study dropout, although failure to meet weight loss and/or adherence criteria prevented entry into the maintenance phase for individuals in 17 studies.
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Another potential drawback involves the effect of study dropouts on the validity of study findings.
Some items were not applicable, because of study design (no losses or dropouts in cross-sectional studies and medical record reviews).
Study dropout was a problem because the study was long, repetitive, and time intensive.
The second comparison in this study (group exercise) was not considered because of a dropout rate of 60%.
Because of differential dropout of participants with characteristics of importance to the study, we performed analyses using stabilized inverse probability-of-censoring weights to reduce potential bias.
Thirteen charter campuses are in danger of closing because of high dropout or low completion rates.
The order of infusion was counterbalanced but, because of participant dropout, counterbalancing was incomplete.
Therefore, we believe that bias because of selective dropout was limited.
Another limitation is the high dropout rate of study participants.
In a follow-up study the time-to-event may be censored either because of dropouts or the end of study is earlier.
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