|LETTER TO EDITOR
|Year : 2019 | Volume
| Issue : 2 | Page : 144
Correlates of physical disability in the elderly population of rural North India (Haryana)
Md A Bashar
Department of Community Medicine, School of Public Health, PGIMER, Chandigarh, India
|Date of Web Publication||29-Apr-2019|
Dr. Md A Bashar
R. No. 125, School of Public Health, PGIMER, Chandigarh - 160 012
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Bashar MA. Correlates of physical disability in the elderly population of rural North India (Haryana). J Fam Community Med 2019;26:144
I read with great interest the article by Khan et al. titled, “Correlates of physical disability in the elderly population of a rural population of North India.” However, certain issues undermine the validity of the study findings:
First, the authors arrived at the requisite sample size by taking the relative precision as 20%, which is too high and hence erroneous. Most authors recommend a relative precision of 5% if prevalence of the disease/condition is expected to be between 10% and 90%.
Second, the authors used the Barthel index together with Katz index to assess physical disability in the study population and defined physical disability as needing help in one or more of the activities of daily living activities included in the index. However, the Barthel index is an ordinal scale with scores ranging from 0–2 to 0–3 for each of the 10 items totaling 0–20. The authors should have mentioned the cutoff score for classifying an elderly person as physically disabled as per the scoring system rather than rely on subjective assessment.
These issues should be considered when the validity of the study findings is examined.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
| References|| |
Khan ZA, Singh C, Khan T. Correlates of physical disability in the elderly population of rural North India (Haryana). J Family Community Med 2018;25:199-204.
Pourhoseingholi MA, Vahedi M, Rahimzadeh M. Sample size calculation in medical studies. Gastroenterol Hepatol Bed Bench 2013;6:14-7.