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LETTER
Year : 2016  |  Volume : 62  |  Issue : 1  |  Page : 51-52

Calculating incidence in cross-sectional studies


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

Date of Web Publication5-Jan-2016

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


DOI: 10.4103/0022-3859.173217

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How to cite this article:
Raina S K. Calculating incidence in cross-sectional studies. J Postgrad Med 2016;62:51-2

How to cite this URL:
Raina S K. Calculating incidence in cross-sectional studies. J Postgrad Med [serial online] 2016 [cited 2019 Dec 9];62:51-2. Available from: http://www.jpgmonline.com/text.asp?2016/62/1/51/173217


Sir,

I went through with interest the article entitled "Incidence and factors associated with medication nonadherence in patients with mental illness: A cross-sectional study" published in the "Journal of Postgraduate Medicine" (2015; 16:251-6). [1]

The authors have conducted a cross-sectional study in the outpatient psychiatric department of a tertiary care private hospital over a period of 1 year and followed up the patients receiving at least one psychotropic medication for at least 1 month. The authors concluded that the overall incidence of medication nonadherence in patients with mental illness was 43%. I have concerns regarding the calculation of incidence for which reference to time is important. [2]

The authors have actually provided us with an estimate of the proportion of nonadherence among patients on psychotropic medication and not incidence. As incidence involves a reference to time; it is not expressed as a percentage (as done by the authors) but as person-time. [3] In contrast, the proportion in statistics refers to the fraction of the total that possesses a certain attribute such as nonadherence in case of this study.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
 :: References Top

1.
Lucca JM, Ramesh M, Parthasarathi G, Ram D. Incidence and factors associated with medication nonadherence in patients with mental illness: A cross-sectional study. J Postgrad Med 2015;61:251-6.  Back to cited text no. 1
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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
    
3.
Raina SK. Incidence of malignancies in biopsy-proven inflammatory myopathy: Comment and erratum. Neurol India 2013;61:340.  Back to cited text no. 3
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Online since 12th February '04
2004 - Journal of Postgraduate Medicine
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