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. 1994 Feb;48(1):92–97. doi: 10.1136/jech.48.1.92

General practitioner notes as a source of information for case-control studies in young women. UK National Case-Control Study Group.

C E Chilvers 1, M C Pike 1, C N Taylor 1, C Hermon 1, B Crossley 1, S J Smith 1
PMCID: PMC1059901  PMID: 8138777

Abstract

STUDY OBJECTIVE--The UK National Case-Control Study was carried out to investigate the relationship between oral contraceptive use and breast cancer risk. This study investigates whether general practitioner notes could be used as the sole data source for epidemiological studies of young women and what the effect would be on non-response and recall bias. DESIGN--Case-control study with data on gynaecological, obstetric, and contraceptive history collected at interview and from general practitioners' notes. Information from these two sources was compared. SETTING--This was a population-based study. PARTICIPANTS--Altogether 755 women with breast cancer aged under 36 years at diagnosis, each with an age-matched control, participated in the study. Response rates at interview were 72% and 89% for cases and controls but GP data were available for 90% of the 1049 case and first-selected control pairs. MAIN RESULTS--There was generally good agreement between the two data sources with respect to obstetric history and gynaecological procedures (hysterectomy, oophorectomy, and tubal ligation). The use of intra-uterine devices, or diaphragm, and partner's vasectomy were not reliably recorded in the GP's notes. The overall results of the UK study would have been qualitatively the same with respect to the relationship between oral contraceptive use and breast cancer risk if GP notes only had been used, in spite of the fact that only about half of all oral contraceptive usage was recorded in the notes. Response rates would have been higher, recall bias eliminated, and the cost of the study halved. CONCLUSIONS--When planning case-control studies in young women, the possibility of using GP notes as the primary data source should be considered. Lack of data on potential confounding factors is a possible drawback to such use. The practice of destroying GP's notes shortly after the death of patients seriously restricts the possibility of using these notes when studying rapidly fatal conditions.

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Selected References

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  1. Adam S. A., Sheaves J. K., Wright N. H., Mosser G., Harris R. W., Vessey M. P. A case-control study of the possible association between oral contraceptives and malignant melanoma. Br J Cancer. 1981 Jul;44(1):45–50. doi: 10.1038/bjc.1981.145. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Bean J. A., Leeper J. D., Wallace R. B., Sherman B. M., Jagger H. Variations in the reporting of menstrual histories. Am J Epidemiol. 1979 Feb;109(2):181–185. doi: 10.1093/oxfordjournals.aje.a112673. [DOI] [PubMed] [Google Scholar]
  3. Colditz G. A., Stampfer M. J., Willett W. C., Stason W. B., Rosner B., Hennekens C. H., Speizer F. E. Reproducibility and validity of self-reported menopausal status in a prospective cohort study. Am J Epidemiol. 1987 Aug;126(2):319–325. doi: 10.1093/aje/126.2.319. [DOI] [PubMed] [Google Scholar]
  4. Coulter A., McPherson K., Elliott S., Whiting B. Accuracy of recall of surgical histories: a comparison of postal survey data and general practice records. Community Med. 1985 Aug;7(3):186–189. [PubMed] [Google Scholar]
  5. Coulter A., Vessey M., McPherson K., Crossley B. The ability of women to recall their oral contraceptive histories. Contraception. 1986 Feb;33(2):127–137. doi: 10.1016/0010-7824(86)90079-x. [DOI] [PubMed] [Google Scholar]
  6. Forman D., Vincent T. J., Doll R. Cancer of the liver and the use of oral contraceptives. Br Med J (Clin Res Ed) 1986 May 24;292(6532):1357–1361. doi: 10.1136/bmj.292.6532.1357. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Glass R., Johnson B., Vessey M. Accuracy of recall of histories of oral contraceptive use. Br J Prev Soc Med. 1974 Nov;28(4):273–275. doi: 10.1136/jech.28.4.273. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Harlow S. D., Linet M. S. Agreement between questionnaire data and medical records. The evidence for accuracy of recall. Am J Epidemiol. 1989 Feb;129(2):233–248. doi: 10.1093/oxfordjournals.aje.a115129. [DOI] [PubMed] [Google Scholar]
  9. Irwin K. L., Wingo P. A., Lee N. C. Agreement of self-reported ovarian number following gynecologic surgery with medical record reports. J Clin Epidemiol. 1990;43(2):181–187. doi: 10.1016/0895-4356(90)90182-o. [DOI] [PubMed] [Google Scholar]
  10. Landis J. R., Koch G. G. The measurement of observer agreement for categorical data. Biometrics. 1977 Mar;33(1):159–174. [PubMed] [Google Scholar]
  11. McKinney P. A., Alexander F. E., Nicholson C., Cartwright R. A., Carrette J. Mothers' reports of childhood vaccinations and infections and their concordance with general practitioner records. J Public Health Med. 1991 Feb;13(1):13–22. doi: 10.1093/oxfordjournals.pubmed.a042571. [DOI] [PubMed] [Google Scholar]
  12. Neuberger J., Forman D., Doll R., Williams R. Oral contraceptives and hepatocellular carcinoma. Br Med J (Clin Res Ed) 1986 May 24;292(6532):1355–1357. doi: 10.1136/bmj.292.6532.1355. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Oakley A., Rajan L., Robertson P. A comparison of different sources of information about pregnancy and childbirth. J Biosoc Sci. 1990 Oct;22(4):477–487. doi: 10.1017/s0021932000018885. [DOI] [PubMed] [Google Scholar]
  14. Paganini-Hill A., Ross R. K. Reliability of recall of drug usage and other health-related information. Am J Epidemiol. 1982 Jul;116(1):114–122. doi: 10.1093/oxfordjournals.aje.a113386. [DOI] [PubMed] [Google Scholar]
  15. Rosenberg M. J., Layde P. M., Ory H. W., Strauss L. T., Rooks J. B., Rubin G. L. Agreement between women's histories of oral contraceptive use and physician records. Int J Epidemiol. 1983 Mar;12(1):84–87. doi: 10.1093/ije/12.1.84. [DOI] [PubMed] [Google Scholar]
  16. Stolley P. D., Tonascia J. A., Sartwell P. E., Tockman M. S., Tonascia S., Rutledge A., Schinnar R. Agreement rates between oral contraceptive users and prescribers in relation to drug use histories. Am J Epidemiol. 1978 Mar;107(3):226–235. doi: 10.1093/oxfordjournals.aje.a112529. [DOI] [PubMed] [Google Scholar]
  17. Tilley B. C., Barnes A. B., Bergstralh E., Labarthe D., Noller K. L., Colton T., Adam E. A comparison of pregnancy history recall and medical records. Implications for retrospective studies. Am J Epidemiol. 1985 Feb;121(2):269–281. doi: 10.1093/oxfordjournals.aje.a113997. [DOI] [PubMed] [Google Scholar]
  18. Wilcox A. J., Horney L. F. Accuracy of spontaneous abortion recall. Am J Epidemiol. 1984 Nov;120(5):727–733. doi: 10.1093/oxfordjournals.aje.a113940. [DOI] [PubMed] [Google Scholar]

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