Do international surveys and censuses exhibit ‘dry season’ bias?

Wright, J.A., Yang, Hong and Walker, Kate (2011) Do international surveys and censuses exhibit ‘dry season’ bias? Population, Space and Place, 18, (1), pp. 116-126. (doi:10.1002/psp.681).


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This study aims to assess whether Demographic and Health Surveys (DHS) and population censuses in developing countries are predominantly conducted during drier months and are therefore subject to seasonal bias. We examined field implementation dates of 176 DHS conducted in 64 countries and enumeration dates of the latest population censuses in 59 of those countries. We compared dry versus wet season implementation rates, distinguishing seasons using mean precipitation estimates and Koppen climate classes for each country. For countries with seasonal precipitation climates, 23% of 39 censuses were conducted in the wet season, compared with an expected 47%. In the same countries, 43.3% of DHS fieldwork took place in the wet season, compared with an expected 45.4%. There was thus a slight tendency for DHS and greater, statistically significant tendency for censuses to be implemented in drier months. Thus, the recent censuses analysed exhibit greater ‘dry season’ bias than DHS when viewed internationally. Since past studies have identified seasonal patterns in diarrhoea incidence, water source and malarial bednet use, care should be taken when comparing census and survey results for these variables internationally

Item Type: Article
Digital Object Identifier (DOI): doi:10.1002/psp.681
ISSNs: 1544-8444 (print)
ePrint ID: 188521
Date :
Date Event
2011Accepted/In Press
Date Deposited: 04 Jul 2011 08:04
Last Modified: 18 Apr 2017 02:05
Further Information:Google Scholar

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