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Cover page of the Journal of Health Sciences


 
 Table of Contents  
LETTER TO THE EDITOR
Year : 2022  |  Volume : 15  |  Issue : 2  |  Page : 186

Comment on “correlation between cigarette smoking and raised intraocular pressure in males”


Department of Ophthalmology, IMS and SUM Hospital, Bhubaneswar, Odisha, India

Date of Submission08-Jun-2021
Date of Acceptance08-Feb-2022
Date of Web Publication24-May-2022

Correspondence Address:
Dr Jasmita Satapathy
Department of Ophthalmology, IMS and SUM Hospital, Bhubaneswar - 751 003, Odisha
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/kleuhsj.kleuhsj_162_21

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How to cite this article:
Satapathy J. Comment on “correlation between cigarette smoking and raised intraocular pressure in males”. Indian J Health Sci Biomed Res 2022;15:186

How to cite this URL:
Satapathy J. Comment on “correlation between cigarette smoking and raised intraocular pressure in males”. Indian J Health Sci Biomed Res [serial online] 2022 [cited 2022 Jul 2];15:186. Available from: https://www.ijournalhs.org/text.asp?2022/15/2/186/345822



Dear Editor,

It was interesting reading the article entitled, “Correlation between cigarette smoking and raised intraocular pressure (IOP) in males.”[1] I congratulate the authors for the important analysis. However, I have few important observations and suggestions to make regarding the study design.

Firstly, to find the correlation between smoking and IOP, it would have been better to divide the groups as smokers (Group A) and nonsmokers (Group B) and then comparing mean IOP between two groups. However, the authors have made two groups as Group A (those with raised IOP irrespective of visual field defect and optic neuropathy) and Group B (those with normal IOP and without any ocular signs and symptoms). By doing so, it could so happen that you might not get a good number of patients with history of smoking in either group or in Group A, which in turn might interfere in proper data analysis.

Second, potential confounders need to be dealt with during study design as they can lead to erroneous conclusions.[2] Confounding variables are those that may compete with the exposure of interest in explaining the outcome of a study.[2] Hypertension is a true confounder here which is predictive of the outcome (raised IOP) even in the absence of the exposure (cigarette smoking). It would have been better if hypertension is included in exclusion criteria. Although it is possible to have residual confounding by the factors that are unknown and cannot be measured, the true confounders have to be taken care of to avoid bias.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Mukherji S, Karmakar S, Dasgupta S. Correlation between cigarette smoking and raised intraocular pressure in males. Indian J Health Sci Biomed Res 2021;14:245-8.  Back to cited text no. 1
  [Full text]  
2.
Skelly AC, Dettori JR, Brodt ED. Assessing bias: The importance of considering confounding. Evid Based Spine Care J 2012;3:9-12.  Back to cited text no. 2
    




 

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