Circumcision and Urinary Tract Infection

William F. Rosenberger
JAMA. 1992;268(1):55. doi:10.1001/jama.1992.03490010056027.
Text Size: A A A
Published online

To the Editor.  —Spach et al1 reported a case-control study of 78 young men and concluded that lack of circumcision increases the risk of urinary infection. Their "Statistical Analysis" section of the report consisted of the single sentence, "Comparison between bacteriuric and nonbacteriuric groups were made by χ2 analysis."This is a rather nonspecific statement given that there are a multitude of tests that are useful for 2×2 contingency tables that have an asymptotic χ2 distribution. These include the Pearson χ2 test and the likelihood ratio G2 statistic. It is well known that these asymptotic tests can give only approximate results when there is a small total sample size or small numbers in individual cells. One rule often stated is that expected cell sizes should exceed four or five. However, Fienberg states that "obvious exceptions to the rule of 'average cell sizes of 4 or


Sign In to Access Full Content

Don't have Access?

Register and get free email Table of Contents alerts, saved searches, PowerPoint downloads, CME quizzes, and more

Subscribe for full-text access to content from 1998 forward and a host of useful features

Activate your current subscription (AMA members and current subscribers)

Purchase Online Access to this article for 24 hours




Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).


Some tools below are only available to our subscribers or users with an online account.

Sign In to Access Full Content

Related Content

Customize your page view by dragging & repositioning the boxes below.