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Table 3 Meta-analytic regression results between retention strategy themes and retention rate

From: Retention strategies in longitudinal cohort studies: a systematic review and meta-analysis

  Estimate CI (Lower - Upper) P I2
Model 1: Continuous total number of retention strategy types     99.86%
 Barriers 0.17 0.03–0.32 0.02*  
 Community −0.03 − 0.18 - 0.11 0.63  
 Follow-up/reminder −0.15 −0.29 - -0.01 0.04*  
 Tracing 0.11 −0.06 - 0.27 0.22  
 Study duration −0.04 −0.08 - 0.00 0.06  
 Number of waves 0.00 −0.02 - 0.03 0.81  
Model 2: Binary usage of retention strategy types     99.84%
 Barriers 0.35 −0.15 - 0.86 0.16  
 Community 0.35 −0.14 - 0.83 0.16  
 Follow-up/reminder −0.83 −1.40 - -0.27 0.00**  
 Tracing 0.11 −0.36 - 0.59 0.64  
 Study duration −0.03 −0.08 - 0.01 0.10  
 Number of waves 0.01 −0.02 - 0.03 0.61  
Model 3: All individual strategies with p < 0.1     99.85%
 Tracing - Locator form documentation 0.59 −0.44 - 1.62 0.26  
 Follow-up - Reminder Phone call −0.72 −1.20 - -0.25 0.00**  
 Community - Thank you and birthday cards 0.44 −0.11 - 0.98 0.12  
 Barriers - Site and home visits 0.42 −0.05 - 0.88 0.08  
 Barriers - Consistency in research staff 0.39 −0.42 - 1.20 0.34  
 Barriers - Alternative method of data collection 0.59 0.14–1.05 0.01**  
 Study duration −0.04 − 0.08 - − 0.00 0.05*  
 Number of waves -0.00 −0.03 - 0.02 0.89  
  1. *p < .05
  2. **p < .01