Length of hospital stay and number of medical visits by children with culture-confirmed influenza. ED = emergency department. * The mean number of medical visits = number of reported additional medical visits + initial 1 primary care or ED visit. † Length of stay in the ED, rather than in the hospital. Notes: Each point represents a mean or median value from one of the identified studies: ♦ = mean value; ▪ = median value. Effect sizes around each point represent standard deviation if value is a mean, range if value is a median.