Monthly difference between evening and morning salivary cortisol levels.

Monthly p-values for difference between evening and morning cortisol on a group level using Wilcoxon’s rank-sum test. Age for sampling measured in: Month and Mean Day for sampling during full-term infants’ first year of life. Number of infants that submitted analyzable samples for evening/morning range in each month. Monthly difference between evening and morning salivary cortisol levels.