BACKGROUND: The conduct of longitudinal clinical trials must involve effective strategies to retain study participants in order to ensure internal validity, adequate statistical power and generalizability of results. PURPOSE: In a large trial in Peru, we implemented various retention strategies to maintain high participation rates over time. METHODS: Novel participant retention strategies were used to follow highly marginalized populations for two years because traditional locator information, such as telephone numbers and official identification (eg, passport, driver's license, the local equivalent of a social security number) were often unreliable or unavailable. These strategies included detailed preliminary ethnographic research to identify the behaviours of key target groups, approaches to develop strong informal bonds between project staff and participants outside of study settings, and methods to enhance positive participant attitudes towards the study. RESULTS: The overall study retention rate after two years was 84%, even though only 26% of the study populations supplied complete locator information (telephone, address and the names of two friends). LIMITATIONS: The retention strategies used were labour intensive and iterative, which could prove difficult to replicate. CONCLUSIONS: The two-year retention rate in this study was sufficient to maintain required sample sizes. The methods used to maintain contact with the populations were labour intensive, low tech and adequate for these populations and could be used to retain study participants in other marginalized, urban, low-income areas.
BACKGROUND: The conduct of longitudinal clinical trials must involve effective strategies to retain study participants in order to ensure internal validity, adequate statistical power and generalizability of results. PURPOSE: In a large trial in Peru, we implemented various retention strategies to maintain high participation rates over time. METHODS: Novel participant retention strategies were used to follow highly marginalized populations for two years because traditional locator information, such as telephone numbers and official identification (eg, passport, driver's license, the local equivalent of a social security number) were often unreliable or unavailable. These strategies included detailed preliminary ethnographic research to identify the behaviours of key target groups, approaches to develop strong informal bonds between project staff and participants outside of study settings, and methods to enhance positive participant attitudes towards the study. RESULTS: The overall study retention rate after two years was 84%, even though only 26% of the study populations supplied complete locator information (telephone, address and the names of two friends). LIMITATIONS: The retention strategies used were labour intensive and iterative, which could prove difficult to replicate. CONCLUSIONS: The two-year retention rate in this study was sufficient to maintain required sample sizes. The methods used to maintain contact with the populations were labour intensive, low tech and adequate for these populations and could be used to retain study participants in other marginalized, urban, low-income areas.
Authors: Kelika A Konda; Jeffrey D Klausner; Andres G Lescano; Segundo Leon; Franca R Jones; Jose Pajuelo; Carlos F Caceres; Thomas J Coates Journal: Sex Transm Dis Date: 2005-09 Impact factor: 2.830
Authors: Mace Coday; Carla Boutin-Foster; Tamara Goldman Sher; Jennifer Tennant; Mary L Greaney; Sandra D Saunders; Grant W Somes Journal: Ann Behav Med Date: 2005-04
Authors: J A Kelly; J S St Lawrence; L Y Stevenson; A C Hauth; S C Kalichman; Y E Diaz; T L Brasfield; J J Koob; M G Morgan Journal: Am J Public Health Date: 1992-11 Impact factor: 9.308
Authors: Larry D Icard; John B Jemmott; Craig Carty; Ann O'Leary; Lulama Sidloyi; Janet Hsu; JoAnn Tyler; Omar Martinez Journal: Prev Sci Date: 2017-07
Authors: Doyt L Conn; Yi Pan; Kirk A Easley; Dawn L Comeau; Joyce P Carlone; Steven D Culler; Athan Tiliakos Journal: Clin Rheumatol Date: 2012-09-29 Impact factor: 2.980
Authors: Seema Sahay; Nikhil Gupte; Radhika G Brahme; Amit Nirmalkar; Shilpa Bembalkar; Robert C Bollinger; Sanjay Mehendale Journal: PLoS One Date: 2011-03-11 Impact factor: 3.240