The evaluation of classified advertisements for gastroenterology in NEJM 1985-2004

Nirmal S Mann, Rafael E. Diaz

Research output: Contribution to journalArticlepeer-review


Objective: To analyze the number of classified advertisements for Gastroenterology in comparison with those for Cardiology in New England Journal of Medicine (NEJM) over a 20 year period from 1985 to 2004. To evaluate if the increase in advertisement for gastroenterology are related to the demand for screening colonoscopy. Methods: Advertisements for gastroenterology and cardiology from each issue of NEJM were manually counted. The mean number of advertisements per week were calculated, smallest and largest number of advertisements for cardiology and gastroenterology were noted. Cardiology/Gastroenterology (C/G) ratio per week was calculated. Appropriate statistical methods were used to analyze and compare the data. Results: In this 20 year period there were 76713 advertisements for cardiology; mean 73.76 ± 36.25 (range 14-218) per week. There were 26130 advertisements for gastroenterology; mean 25.12 ± 18.35 (range 1-122) per week. The C/G ratio for 20 years was 2.93 ± 4.30 (range 1.37-18.20) per week. The C/G ration in the years 1985 to 1997 was significantly higher (3.10-5.81) compared to C/G ratio from 1998 to 2004 which was 1.85-2.79 suggesting a disproportionate increase in the no. of Ads for G correlating with demand for screening colonoscopy. Conclusions: Ads for C (and presumably demand for services) was three times that for G. The ads for G increased after the introduction for screening colonoscopy. The implications of this development are discussed.

Original languageEnglish (US)
Pages (from-to)243-247
Number of pages5
JournalInternational Medical Journal
Issue number4
StatePublished - Dec 2006


  • Cardiology
  • Classified advertisements
  • Gastroenterology
  • Screening colonoscopy

ASJC Scopus subject areas

  • Medicine(all)


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