Primary and secondary outcomes by study group.

FFisher's exact test.*Temperature values were missing for one subject in the acetaminophen group and two subjects in the placebo group; the analyses included N = 175 in the acetaminophen group and N = 174 in the placebo group.**If two parents reported, selected parent with the least amount of sleep.***P-values from Poisson regression with robust variance unless otherwise indicated.****All other less extreme Likert categories as reference.†N = 143 in the acetaminophen group and 140 in the placebo group.