Plasma cortisol levels in Brazilians college students with poor sleep quality

Abstract Aim To investigate the association between sleep quality in Brazilian university students and plasma cortisol levels. Method A cross-sectional study conducted with 688 university students assessing sociodemographic indicators, quality of sleep and cortisol levels. We used Poisson robust regression to assess the association. Results Approximately 95% and 7% of the sample showed poor sleep quality and high levels of cortisol, respectively. These lingered 16-30 minutes to fall asleeep (p = 0.030), with 65-74% efficiency (p = 0.021) and greater workload those with normal levels of cortisol (p = 0.021). The chances of a college student, with high plasma cortisol levels, to present poor sleep quality were similar to good sleepers and with no significant statistical significance (p = 0.124). Conclusion There was no statistically significant association between plasma cortisol levels of and quality of sleep in college students.

摘要：
研究目的：探讨巴西大学生睡眠质量与血浆皮质醇水平的关联。
研究方法：本研究为横断面研究，纳入688名大学生，对其社会人口学指标、睡眠质量及血浆皮质醇水平进行评估，采用稳健泊松回归分析二者的关联。
研究结果：样本中约95%的个体存在睡眠质量不佳的情况，7%的个体血浆皮质醇水平升高。睡眠质量不佳者的入睡潜伏期长达16~30分钟（p=0.030）、睡眠效率为65%~74%（p=0.021）；与皮质醇水平正常者相比，课业负担更重的群体其皮质醇水平更高（p=0.021）。血浆皮质醇水平升高的大学生出现睡眠质量不佳的概率与睡眠质量良好者相近，差异无统计学意义（p=0.124）。
研究结论：大学生血浆皮质醇水平与睡眠质量之间未发现具有统计学意义的关联。