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Diurnal pattern of salivary cortisol (A) and DHEA (B). Four samples were collected throughout the day (after awakening, 11AM, 4PM, and before bedtime) from 78 volunteers who were 30 to 40 years of age. Steroid levels were determined with RIA. Each point represents cortisol (A) or DHEA (B) levels of a participant. The bar represents the mean values of each sample time.
