Median number of specimens tested and percent positive for influenza, by age group, study design, and population, among studies included in the meta-analysis.

Median number of specimens tested and percent positive for influenza, by age group, study design, and population, among studies included in the meta-analysis.本荟萃分析（meta-analysis）纳入的各项研究中，按年龄组、研究设计及研究人群分类统计的流感检测样本中位数与流感阳性率。