Indian Journal of Public Health

LETTER TO THE EDITOR
Year
: 2010  |  Volume : 54  |  Issue : 2  |  Page : 105--106

On, "Coverage of ante-natal care in a block of West Bengal using lot quality assurance sampling"


Dipak Pal1, Suprakas Hazra2,  
1 Associate Professor, Department of Epidemiology, All India Institute of Hygiene and Public Health, Kolkata, India
2 Demonstrato, Department of Epidemiology, All India Institute of Hygiene and Public Health, Kolkata, India

Correspondence Address:
Dipak Pal
Associate Professor, Department of Epidemiology, All India Institute of Hygiene and Public Health, Kolkata
India




How to cite this article:
Pal D, Hazra S. On, "Coverage of ante-natal care in a block of West Bengal using lot quality assurance sampling".Indian J Public Health 2010;54:105-106


How to cite this URL:
Pal D, Hazra S. On, "Coverage of ante-natal care in a block of West Bengal using lot quality assurance sampling". Indian J Public Health [serial online] 2010 [cited 2019 Sep 18 ];54:105-106
Available from: http://www.ijph.in/text.asp?2010/54/2/105/73280


Full Text

Sir,

This is in reference to the article titled "Coverage of ante-natal care in a block of West Bengal using Lot Quality Assurance Sampling" by Pal, Mahapatra, Mukhopadhyay et al. published in the Indian Journal of Public Health, Vol. 53 No. 4 October-December, 2009, p-256-258. The authors need to be complemented for using the Lot Quality Assurance Sampling (LQAS) method to assess the coverage of ante-natal care in a block. It was a cross-sectional descriptive study carried out in the Bankura I Community Development Block catered to by 18 sub-centers. The sub-centers were considered as individual lots in the study. This type of study was the method of choice as the objective of the study was not only to estimate the overall coverage of the entire block but also to identify the sub-centers where it is deficient such that appropriate measures can be implemented to improve the situation. Only one sub-center out of the 18 in the study was found to be qualified for an "acceptable" level of appropriate ante-natal care.

It was learnt from the study that the authors used the Probability Proportional to Size sampling to select the villages and, in the selected villages, "with a random start from the centre of the village, the consecutive households were visited till the required number of eligible women for that village was obtained."

In this context, it may be mentioned that the LQAS method is conceived not only to obtain an overall population estimate but also to determine whether the individual lots are acceptable or not. [1] Making an inference about an individual lot by visiting consecutive households in selected villages till the required number of eligible women is obtained is not appropriate and can be misleading. Accordingly, the lot sample size (here, 11 eligible women) should have been selected by a random sampling technique from each lot (here, sub-centre) and not by visiting consecutive households. [2] Therefore, the results obtained by the authors by visiting consecutive households might have been different if proper guidelines were followed and, consequently, the inference drawn would have differed.

References

1Hoshaw-Woodard S. Description and comparison of the methods of cluster sampling and lot quality assurance sampling to assess immunization coverage; Center for Biostatistics, The Ohio State University; Department of Vaccines and Biologicals. Geneva: World Health Organization; 2001.
2World Health Organisation. Monitoring immunization services using the Lot Quality Technique. Vaccine Research and Development. Geneva: World Health Organization; 1996.