Characteristics of all household members, those with laboratory-confirmed influenza^a, household index cases^b, exposed household members^c and secondary cases^d: the Household Influenza Vaccine Effectiveness (HIVE) study, Ann Arbor Michigan, 2010-2011 influe

*P-value < 0.05 from Chi-square test for independence of outcome across categories. **P-value < 0.001 from Chi-square test for independence of outcome across categories. aIncludes all 125 individuals with laboratory-confirmed influenza (both index and secondary cases). bIncludes 85 index/co-index cases from the first household introductions of influenza only; 15 index/co-index cases from second household introductions of influenza were excluded. cIncludes 267 household members who were exposed to 85 index/co-index cases from the first household introductions of influenza. dIncludes 26 secondary cases resulting from the first household introductions of influenza; 4 secondary cases resulting from second household introductions of influenza were excluded. eThe percent values presented are column percentages that add to 100 for each participant characteristic. fThe percent values presented are row percentages with the cell immediately to the left as the denominator.* 组间结局独立性卡方检验的P值<0.05。 ** 组间结局独立性卡方检验的P值<0.001。 a 纳入所有125名经实验室确诊的流感感染者（包括索引病例与续发病例）。 b 仅纳入首次流感家庭传播引入的85例索引/共索引病例；排除15例来自流感第二次家庭传播引入的索引/共索引病例。 c 纳入267名暴露于首次流感家庭传播引入的85例索引/共索引病例的家庭成员。 d 纳入由首次流感家庭传播引入导致的26例续发病例；排除4例由流感第二次家庭传播引入导致的续发病例。 e 本次呈现的百分比为列百分比，即每一项参与者特征的列占比总和为100%。 f 本次呈现的百分比为行百分比，以紧邻左侧单元格作为计算分母。