Internet-based control recruitment for a case-control study of major risk factors for stroke in Korea

Lessons from the experience

Jong Moo Park, Yong Jin Cho, Kyung Bok Lee, Tai Hwan Park, Soo Joo Lee, Moon Ku Han, Youngchai Ko, Jun Lee, Jae Kwan Cha, Byung Chul Lee, Kyung Ho Yu, Mi Sun Oh, Ji Sung Lee, Juneyoung Lee, Hee Joon Bae

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Background: This study aimed to estimate the population-attributable risks (PARs) of 9 major risk factors for stroke in Korea through a case-control study and to test the feasibility and validity of internet-based control recruitment. Methods: From April 2008 to September 2009 controls were enrolled via internet after providing consent for participation through a web-based survey. The cases included patients who were admitted to the participating centers due to acute stroke or transient ischemic attack within 7 days of onset during the study period. Each control was age- and sex-matched with 2 cases. Adjusted odd ratios, age-standardized prevalence, and PARs were estimated for the 9 major risk factors using the prevalence of risk factors in the control group and the age and sex characteristics from Korea's national census data. Results: In total, 1041 controls were matched to 2082 stroke cases. Because of a shortage of elderly controls in the internet-based recruitment, 248 controls were recruited off-line. The PARs were 23.44%, 10.95%, 51.32%, and 6.35% for hypertension, diabetes, smoking, and stroke history, respectively. Hypercholesterolemia, atrial fibrillation, obesity, coronary heart disease, and a family history of stroke were not associated with stroke. Comparison with education and religion of the control group with that mentioned in the national census data showed a notable difference. Conclusions: The study results imply that internet-based control recruitment for a case- control study requires careful selection of risk factors with high self-awareness and effective strategies to facilitate the recruitment of elderly participants.

Original languageEnglish
Pages (from-to)2559-2565
Number of pages7
JournalJournal of Stroke and Cerebrovascular Diseases
Volume23
Issue number10
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Korea
Internet
Case-Control Studies
Stroke
Censuses
Population
Control Groups
Transient Ischemic Attack
Religion
Hypercholesterolemia
Sex Characteristics
Atrial Fibrillation
Coronary Disease
Obesity
Smoking
Odds Ratio
Hypertension
Education

Keywords

  • Based study
  • Case
  • Control study
  • Internet
  • Risk factors
  • Stroke

ASJC Scopus subject areas

  • Surgery
  • Rehabilitation
  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine

Cite this

Internet-based control recruitment for a case-control study of major risk factors for stroke in Korea : Lessons from the experience. / Park, Jong Moo; Cho, Yong Jin; Lee, Kyung Bok; Park, Tai Hwan; Lee, Soo Joo; Han, Moon Ku; Ko, Youngchai; Lee, Jun; Cha, Jae Kwan; Lee, Byung Chul; Yu, Kyung Ho; Oh, Mi Sun; Lee, Ji Sung; Lee, Juneyoung; Bae, Hee Joon.

In: Journal of Stroke and Cerebrovascular Diseases, Vol. 23, No. 10, 01.01.2014, p. 2559-2565.

Research output: Contribution to journalArticle

Park, JM, Cho, YJ, Lee, KB, Park, TH, Lee, SJ, Han, MK, Ko, Y, Lee, J, Cha, JK, Lee, BC, Yu, KH, Oh, MS, Lee, JS, Lee, J & Bae, HJ 2014, 'Internet-based control recruitment for a case-control study of major risk factors for stroke in Korea: Lessons from the experience', Journal of Stroke and Cerebrovascular Diseases, vol. 23, no. 10, pp. 2559-2565. https://doi.org/10.1016/j.jstrokecerebrovasdis.2014.05.026
Park, Jong Moo ; Cho, Yong Jin ; Lee, Kyung Bok ; Park, Tai Hwan ; Lee, Soo Joo ; Han, Moon Ku ; Ko, Youngchai ; Lee, Jun ; Cha, Jae Kwan ; Lee, Byung Chul ; Yu, Kyung Ho ; Oh, Mi Sun ; Lee, Ji Sung ; Lee, Juneyoung ; Bae, Hee Joon. / Internet-based control recruitment for a case-control study of major risk factors for stroke in Korea : Lessons from the experience. In: Journal of Stroke and Cerebrovascular Diseases. 2014 ; Vol. 23, No. 10. pp. 2559-2565.
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abstract = "Background: This study aimed to estimate the population-attributable risks (PARs) of 9 major risk factors for stroke in Korea through a case-control study and to test the feasibility and validity of internet-based control recruitment. Methods: From April 2008 to September 2009 controls were enrolled via internet after providing consent for participation through a web-based survey. The cases included patients who were admitted to the participating centers due to acute stroke or transient ischemic attack within 7 days of onset during the study period. Each control was age- and sex-matched with 2 cases. Adjusted odd ratios, age-standardized prevalence, and PARs were estimated for the 9 major risk factors using the prevalence of risk factors in the control group and the age and sex characteristics from Korea's national census data. Results: In total, 1041 controls were matched to 2082 stroke cases. Because of a shortage of elderly controls in the internet-based recruitment, 248 controls were recruited off-line. The PARs were 23.44{\%}, 10.95{\%}, 51.32{\%}, and 6.35{\%} for hypertension, diabetes, smoking, and stroke history, respectively. Hypercholesterolemia, atrial fibrillation, obesity, coronary heart disease, and a family history of stroke were not associated with stroke. Comparison with education and religion of the control group with that mentioned in the national census data showed a notable difference. Conclusions: The study results imply that internet-based control recruitment for a case- control study requires careful selection of risk factors with high self-awareness and effective strategies to facilitate the recruitment of elderly participants.",
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T1 - Internet-based control recruitment for a case-control study of major risk factors for stroke in Korea

T2 - Lessons from the experience

AU - Park, Jong Moo

AU - Cho, Yong Jin

AU - Lee, Kyung Bok

AU - Park, Tai Hwan

AU - Lee, Soo Joo

AU - Han, Moon Ku

AU - Ko, Youngchai

AU - Lee, Jun

AU - Cha, Jae Kwan

AU - Lee, Byung Chul

AU - Yu, Kyung Ho

AU - Oh, Mi Sun

AU - Lee, Ji Sung

AU - Lee, Juneyoung

AU - Bae, Hee Joon

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Background: This study aimed to estimate the population-attributable risks (PARs) of 9 major risk factors for stroke in Korea through a case-control study and to test the feasibility and validity of internet-based control recruitment. Methods: From April 2008 to September 2009 controls were enrolled via internet after providing consent for participation through a web-based survey. The cases included patients who were admitted to the participating centers due to acute stroke or transient ischemic attack within 7 days of onset during the study period. Each control was age- and sex-matched with 2 cases. Adjusted odd ratios, age-standardized prevalence, and PARs were estimated for the 9 major risk factors using the prevalence of risk factors in the control group and the age and sex characteristics from Korea's national census data. Results: In total, 1041 controls were matched to 2082 stroke cases. Because of a shortage of elderly controls in the internet-based recruitment, 248 controls were recruited off-line. The PARs were 23.44%, 10.95%, 51.32%, and 6.35% for hypertension, diabetes, smoking, and stroke history, respectively. Hypercholesterolemia, atrial fibrillation, obesity, coronary heart disease, and a family history of stroke were not associated with stroke. Comparison with education and religion of the control group with that mentioned in the national census data showed a notable difference. Conclusions: The study results imply that internet-based control recruitment for a case- control study requires careful selection of risk factors with high self-awareness and effective strategies to facilitate the recruitment of elderly participants.

AB - Background: This study aimed to estimate the population-attributable risks (PARs) of 9 major risk factors for stroke in Korea through a case-control study and to test the feasibility and validity of internet-based control recruitment. Methods: From April 2008 to September 2009 controls were enrolled via internet after providing consent for participation through a web-based survey. The cases included patients who were admitted to the participating centers due to acute stroke or transient ischemic attack within 7 days of onset during the study period. Each control was age- and sex-matched with 2 cases. Adjusted odd ratios, age-standardized prevalence, and PARs were estimated for the 9 major risk factors using the prevalence of risk factors in the control group and the age and sex characteristics from Korea's national census data. Results: In total, 1041 controls were matched to 2082 stroke cases. Because of a shortage of elderly controls in the internet-based recruitment, 248 controls were recruited off-line. The PARs were 23.44%, 10.95%, 51.32%, and 6.35% for hypertension, diabetes, smoking, and stroke history, respectively. Hypercholesterolemia, atrial fibrillation, obesity, coronary heart disease, and a family history of stroke were not associated with stroke. Comparison with education and religion of the control group with that mentioned in the national census data showed a notable difference. Conclusions: The study results imply that internet-based control recruitment for a case- control study requires careful selection of risk factors with high self-awareness and effective strategies to facilitate the recruitment of elderly participants.

KW - Based study

KW - Case

KW - Control study

KW - Internet

KW - Risk factors

KW - Stroke

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