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The effect of circadian rhythms on cortisol levels. The difference between morning and baseline cortisol levels was insignificant (p = 0.62) before RT. After RT, there was a significant difference between morning and baseline cortisol levels (p = 0.02). The circadian rhythm seemed to exert a greater effect after RT. * Differences were significant at the 0.05 level (2-tailed). Abbreviations: RT, radiotherapy.
