Is correlation between plasma and salivary cortisol levels practically important indicator for stress? A meta-analysis study

Correlation between plasma and salivary cortisol levels

  • Burcu Köksal Lokman Hekim University
Keywords: Stress, Salivary Cortisol, Plasma Cortisol, Meta-analysis

Abstract


The purpose of this study is to examine practical importance of correlation values between plasma and salivary cortisol levels by meta-analysis study. By this way, researchers focusing on cortisol levels in different individuals to decide about their stress situation can use more systemic, practical and reliable evidence than using just salivary or plasma cortisol levels separately. For this purpose, correlational studies from 2000 to up-to-date were collected and they were analyzed by meta-analysis. Results based on 18 effect sizes (n=743) revealed that effect sizes of the correlations between plasma and salivary cortisol levels represented large effects. Overall combined effect size (Hedges’s=1.55) also represented large effect. This finding indicate a practical importance of the correlation values for stress studies. Use of the correlation values for examining cortisol levels in stress studies will be discussed in detail.

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Published
2025/12/22
Section
Originalni rad / Original article