OBJECTIVES: Low participation rates in the selection of population controls are an increasing concern for the validity of case-control studies worldwide. METHODS: We conducted a pilot study to assess two approaches to recruiting population controls in a study of colorectal cancer, including a face-to-face interview and blood sample collection. In the first approach, persons identified through a population roster were invited to participate through a telephone call by an interviewer telephoning on behalf of our research center. In the second approach, individuals were identified from the lists of selected family practitioners and were telephoned on behalf of the family practitioner. RESULTS: When the second method was used, participation rates increased from 42% to 57% and the percentage of refusals decreased from 47% to 13%. The reasons for refusing to participate did not differ significantly between the two methods. CONCLUSIONS: Contact through the family practitioner yielded higher response rates in population controls in the study area. 2010 SESPAS. Published by Elsevier Espana. All rights reserved.
OBJECTIVES: Low participation rates in the selection of population controls are an increasing concern for the validity of case-control studies worldwide. METHODS: We conducted a pilot study to assess two approaches to recruiting population controls in a study of colorectal cancer, including a face-to-face interview and blood sample collection. In the first approach, persons identified through a population roster were invited to participate through a telephone call by an interviewer telephoning on behalf of our research center. In the second approach, individuals were identified from the lists of selected family practitioners and were telephoned on behalf of the family practitioner. RESULTS: When the second method was used, participation rates increased from 42% to 57% and the percentage of refusals decreased from 47% to 13%. The reasons for refusing to participate did not differ significantly between the two methods. CONCLUSIONS: Contact through the family practitioner yielded higher response rates in population controls in the study area. 2010 SESPAS. Published by Elsevier Espana. All rights reserved.
Authors: Michael D Kappelman; Aksel Lange; Rachel L Randell; Patricia V Basta; Robert S Sandler; Kristina Laugesen; Anna Byrjalsen; Tina Christensen; Trine Frøslev; Rune Erichsen Journal: Clin Epidemiol Date: 2018-02-28 Impact factor: 4.790
Authors: Cristina M Villanueva; Esther Gracia-Lavedan; Cristina Bosetti; Elena Righi; Antonio José Molina; Vicente Martín; Elena Boldo; Nuria Aragonés; Beatriz Perez-Gomez; Marina Pollan; Ines Gomez Acebo; Jone M Altzibar; Ana Jiménez Zabala; Eva Ardanaz; Rosana Peiró; Adonina Tardón; Maria Dolores Chirlaque; Alessandra Tavani; Jerry Polesel; Diego Serraino; Federica Pisa; Gemma Castaño-Vinyals; Ana Espinosa; Nadia Espejo-Herrera; Margarita Palau; Victor Moreno; Carlo La Vecchia; Gabriella Aggazzotti; Mark J Nieuwenhuijsen; Manolis Kogevinas Journal: Environ Health Perspect Date: 2016-07-06 Impact factor: 9.031