NPPB and hand, foot and mouth disease: In the multivariate model, EV71 infection (OR 19.944, 95 % CI 6.492–61.271), WBC count (OR 3.428, 95 % CI 1.186–9.914), fasting glucose (OR 19.428, 95 % CI 2.236–168.784), PCT (OR 9.084, 95 % CI 3.462–23.837) and NT-proBNP (>125 pg/mL) (OR 16.649, 95 % CI 4.731–58.585) were each associated with the severity of HFMD.