background:  the primary aim of this study was to determine predictors of missed research appointments in a prospective  andomized placebo injection-controlled trial with evaluations 1 to 3 and 5 to 8 months after enrollment.   methods:  this study represents a secondary use of data from 104 patients that were enrolled in a prospective randomized  ontrolled trial of dexamethasone versus lidocai...

Survival analysis of joint replacement relies on the assumption that surgical procedures in patients lost to follow-up have the same chance of failing as those in patients who continue to be assessed. Our study questions that assumption. During the 16-year follow-up of 2268 patients who had received total hip replacements 142 (6%) were lost to follow-up. The cumulative loss at 15 years was 20%....

Background: Hearing loss is one of the most common birth defects and early detection of this disorder at birth is not possible without hearing screening. The aim of this study was to determine the frequency of loss to-follow-up after neonatal hearing screening and its related factors in KhoramAbad Province - Iran. Methods: This retrospective correlational study was conducted in the time period...