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Mean ± SE plasma total cortisol levels sampled every 30 min over 24 h in the subjects with the least amount of IAF (1st tertile, ○; n = 7) and the subjects with the greatest amount of IAF (3rd tertile, •; n = 7). Median 24-h area under the curve (AUC): total cortisol 6,120 μg-day/dl vs. 8,330 μg-day/dl, 1st vs. 3rd tertile, P = 0.01. Lines and P values signify AUC values during 6-h time blocks that are different in the 1st vs. 3rd tertiles.
