a significant trendP = 0.040
Linear regression showed a significant trend of increase in annual hospitalization incidence for RSV (β = 3.310, P = 0.040), PIV 2 (β = 0.516, P = 0.008), and PIV 3 (β = 2.427, P = 0.001), whereas ADV showed a significant trend of decrease (β = −3.561, P = 0.040) (Fig. 2 ).