Coverage, Density and Completeness of Sources used in Tehran Metropolitan Area Cancer Registry: According to the Data of Esophageal Cancer, 2003-2007

  • Aghaei, Abbas ;
  • Najafi, Farid ;
  • Mosavi-Jarrahi, Alireza ;
  • Ahmadi-Jouibari, Toraj
  • Published : 2012.08.31


Background: The completeness of cancer registration is a major validity index of any reported cancer incidence. The present study aimed to evaluate the esophageal cancer incidence registered in the Tehran Metropolitan Area Cancer Registry. Materials and methods: The data on esophageal cancer abstracted from three sources of 1) pathology departments, 2) medical records, and 3) death certificates during 2003 till 2007 were utilized. The completeness of the data sources were evaluated using coverage (defined as the proportion of a community population with esophageal cancer identified by the source) and density (defined as the proportion of non-empty fields of the data by source). Results: A total 1,404 cases of esophageal cancer were reported for the duration of the study. Pathology provided 771, medical records 432, and death certificates 609. The coverage was 0.55 for pathology, 0.31 for medical records, and 0.43 for death certificates. The respective density values were 0.82, 0.96 and 0.98, respectively. Pathology (0.45) was the most complete source followed by medical records (0.42), and death certificates (0.29). Discussion: A low degree of completeness dictates putting more effort into case finding plus abstracting data more thoroughly.


Cancer-registry;source coverage;distribution density;completeness;esophageal cancer;Iran


  1. Boyle P, Levin B (2008). World cancer report 2008, IARC Press, International Agency for Research on Cancer.
  2. Bullard J, Coleman MP, Robinson D, et al (2000). Completeness of cancer registration: A new method for routine use. Bri J Cancer, 82, 1111.
  3. Chen VW, Ferlay J, Padras JG, et al (1994). Comparability and quality control in cancer registration. International Agency for Research on Cancer(IARC).
  4. Elbasmi AA, Fayaz MS, AL-Mohanadi S, AL-Nesf Y, ALAwadi A (2010). Reliability of the Kuwait Cancer Registry: A Comparison between Breast Cancer Data Collected by Clinical Oncologists and Registry Staff. Asian Pac J Cancer Prev, 11, 735-8.
  5. Goldberg J, Gelfand HM, Levy PS (1980). Registry evaluation methods: A review and case study. Epidemiol Reviews, 2, 210-20.
  6. Habibi A (1985). Epidemiological aspects of cancer in iran. Int Surg, 70, 105.
  7. Hearst N, Hulley SB (1988). Using secondary data. Designing Clinical Research, Williams & Wilkins, Baltimore, 53-62.
  8. Kmet J, Mahboubi E (1972). Esophageal cancer in the caspian littoral of iran: Initial studies. Science, 175, 846-53.
  9. Mathers CD, Boschi-Pinto C, Lopez AD, Murray CJL (2001). Cancer incidence, mortality and survival by site for 14 regions of the world. Geneva: World Health Organization: 8.
  10. Mohagheghi MA, Mosavi-Jarrahi A, Malekzadeh R, Parkin M (2009). Cancer incidence in tehran metropolis: The first report from the tehran population-based cancer registry, 1998 - 2001. Arch Iranian Med, 12, 15-23.
  11. Mohagheghi MA, Mosavi-Jarrahi A (2010). Review of Cancer Registration and Cancer Data in Iran, a Historical Prospect. Asian Pac J Cancer Prev, 11, 1155-7.
  12. Naumann F, Freytag J. C, Leser U (2000). Completeness of information sources, Professoren des Inst. Informatik. 19-23. Available from:
  13. Naumann F, Freytag JC, Leser U (2004). Completeness of integrated information sources. Information Systems, 29, 583-615.
  14. Roos LL, Roos NP, Fisher ES, Bubolz TA (1990). Strengths and weaknesses of health insurance. data systems for assessing outcomes. Med Innovation at the Crossroads, 1, 47-67.
  15. Samadi F, Babaei M, Yazdanbod A, et al (2007). Survival rate of gastric and esophageal cancers in ardabil province, northwest of iran. Arch Iran Med, 10, 32-7.
  16. Scannapieco M, Batini C (2004). Completeness in the relational model: a comprehensive framework. Available from: Http://www.Dis.Uniroma1.It/-monscan/researchactivity/articoli/iq2004.Pdf.
  17. Sorensen HT (1992). Re: A compendium of public health data sources. Am J Epidemiol, 135, 325-6.
  18. Sorensen HT, Ejlersen E, Moller-Petersen J, et al (1993). Oneyear follow-up after the first prescription of strong analgesics outside hospital. Int J Risk and Safety in Med, 4, 209-14.
  19. Stone DH (1986). A method for the validation of data in a register. Public Health, 100, 316-24.
  20. Zendehdel K, Hassanloo ZH, Sedighi Z, et al (2010). Improving quality of cancer registration in iran. Part2: Suggesting new national cancer registration program in iran, based on comparative study of 18 countries. Hakim, 12, 50-7.
  21. Zini A, Nasser N, Vered Y (2012). Oral and pharyngeal cancer among the Arab population in Israel from 1970 to 2006. Asian Pac J Cancer Prev, 13, 585-9.

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