Best-supported logistic regression model fitted to explain variation in AIV infection probability in Blue-winged Teal in Canada and the US, 2007–2010 (n = 13,574).

Abbreviations: β = coefficient estimate, SE = standard error, CI (95% confidence interval), ref = reference, HY = hatch year, AHY = after hatch year. Latitude is standardized to have a mean of 0 and standard deviation of 1. The quadratic term is the standardized latitude squared. Age*Season is the interaction term.Best-supported logistic regression model fitted to explain variation in AIV infection probability in Blue-winged Teal in Canada and the US, 2007–2010 (n = 13,574).

缩写说明：β为系数估计值（coefficient estimate），SE为标准误（standard error），CI为95%置信区间（95% confidence interval），ref为参照（reference），HY为当年孵化个体（hatch year），AHY为隔年孵化个体（after hatch year）。纬度经标准化处理，均值为0，标准差为1。二次项为标准化纬度的平方项。Age*Season为交互项。本研究拟合了支持度最优的逻辑回归模型，用以阐释2007至2010年加拿大与美国境内蓝翅鸭（Blue-winged Teal）的AIV感染概率的变异特征，样本量为13574。