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Observational bias during nutrition surveillance: results of a mixed longitudinal and cross-sectional data collection system in Northern Nigeria.Grellety, E; Luquero, F J; Mambula, C; Adamu, H H; Elder, G; Porten, K; Epicentre, Paris, France. Emmanuel.GRELLETY@epicentre.msf.org (PLoS, 2013-10)The Sahel is subject to seasonal hungry periods with increasing rates of malnutrition. In Northern Nigeria, there is no surveillance system and surveys are rare. The objectives were to analyse possible observational bias in a sentinel surveillance system using repeated mixed longitudinal/cross-sectional data and estimate the extent of seasonal variation.