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Volume 11, Number 11—November 2005


Rift Valley Fever in Small Ruminants, Senegal, 2003

Véronique Chevalier*Comments to Author , Renaud Lancelot†, Yaya Thiongane‡, Baba Sall§, Amadou Diaité‡, and Bernard Mondet¶
Author affiliations: *Centre International de Recherche Agronomique pour le Développement, Montpellier, France; †Ambassade de France, Antananarivo, Madagascar; ‡Institut Sénégalais de Recherche Agricole, Dakar-Hann, Senegal; §Direction de l'Élevage, Dakar, Senegal; ¶Institut de Recherche pour le Développement, Dakar-Hann, Senegal

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Table 6

Parameters of the intercept-only and the best BIC mixed-effect binomial model of Rift Valley fever serologic incidence in small ruminants, Barkedji area, Senegal, 2003 rainy season*

Term Parameter Standard error Z* p†
Intercept-only mixed-effect model
Intercept –3.49 0.58 –5.99 2.1 × 10–9
Variance of the random effect‡ 1.75
Best mixed-effect model according to information criteria
Intercept –1.62 0.67 –2.41 0.02
Surface§ –0.19 0.09 –2.08 0.04
Ferlo¶ –1.95 0.88 –2.21 0.03
Variance of the random effect‡ 0.57

*Ratio of the parameter over its standard error. N = 610 small ruminants; BIC, Bayesian information criterion.
†P(x > |Z|) assuming a standard-normal distribution for Z; straight vertical bars indicate absolute value of Z.
‡Pond-related random effect associated with the intercept.
§Surface (hectare) centered on the smallest observed surface (1.6 hectare).
¶Location of the pond: in the Ferlo bed (reference category) or outside Ferlo bed.

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