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CORRESPONDENCE
Year : 2013  |  Volume : 61  |  Issue : 3  |  Page : 340

Incidence of malignancies in biopsy-proven inflammatory myopathy: Comment and erratum


Department of Community Medicine, Dr. Rajendra Prasad Government Medical College, Tanda, Kangra, Himachal Pradesh - 176 001, India

Date of Submission11-May-2013
Date of Decision13-May-2013
Date of Acceptance17-Jun-2013
Date of Web Publication16-Jul-2013

Correspondence Address:
Sunil K Raina
Department of Community Medicine, Dr. Rajendra Prasad Government Medical College, Tanda, Kangra, Himachal Pradesh - 176 001
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0028-3886.115104

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How to cite this article:
Raina SK. Incidence of malignancies in biopsy-proven inflammatory myopathy: Comment and erratum. Neurol India 2013;61:340

How to cite this URL:
Raina SK. Incidence of malignancies in biopsy-proven inflammatory myopathy: Comment and erratum. Neurol India [serial online] 2013 [cited 2019 Oct 13];61:340. Available from: http://www.neurologyindia.com/text.asp?2013/61/3/340/115104


Sir,

I went through an article entitled "Incidence of malignancies in biopsy-proven inflammatory myopathy" published in your journal (Neurol India 2013; 61:152-5). [1]

The efforts of the authors are laudable, but I fail to understand how the incidence of malignancies was calculated. Having a look at [Table 1] of the study, what we arrived at is the prevalence of malignancy in biopsy-proven inflammatory myopathy and not incidence. When relatively precise data on the timing of events or losses are available for each individual from a defined cohort (as is the case in this study), incidence density needs to be calculated. [2] This is expressed as:



Table 1: Prevalence of malignancy

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The total person-time for the study period is simply the sum of the person-time contributed by each individual.

As incidence encompasses frequency, reference to time is important, and that is why, incidence is not expressed as percentages (as done by the authors) but as person-time.

The authors actually have done a commendable job in data retrieval and finding an association between malignancies and inflammatory myopathy.

[Table 1] of the study is given below:

 
  References Top

1.Kannan MA, Sundaram C, Uppin M, Mridula R, Jabeen SA, Borgohain R. Incidence of malignancies in biopsy-proven inflammatory myopathy. Neurol India 2013;61:152-5.  Back to cited text no. 1
[PUBMED]  Medknow Journal  
2.Szklo M, Nieto FJ. Measuring disease occurrence. In: Szklo M, Nieto FJ, editors. Epidemiology beyond the basics. 2 nd ed. Sudbury, MA: Jones and Bartlett Publishers, Inc; 2007. p. 47-76.  Back to cited text no. 2
    



 
 
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