Comparison of human hair cortisol concentration stability for 1-year and 2-year test-retest intervals.
Stress Health
; 40(5): e3465, 2024 Oct.
Article
in En
| MEDLINE
| ID: mdl-39141658
ABSTRACT
Human hair cortisol concentration (HCC) has previously been found to be highly stable for a 1-year interval (r = 0.73) in terms of a product-moment correlation. The present study aimed to replicate this finding and compare HCC stability regarding 1-year and 2-year test-retest intervals. Female university students (N = 39) provided hair strands twice (t1 and t2) at intervals of 1 (n = 21) or 2 years (n = 18). Multiple regression analysis predicting HCC at t2 revealed a significant interaction term (HCC at t1 × time interval condition). It was determined that HCCs were substantially related for the 1-year interval but unrelated for the 2-year interval. The findings were not attributable to potential influences, such as hair treatment. The product-moment correlation showed nearly identical consistency with previous research regarding the 1-year test-retest interval. There was no significant product-moment correlation for the 2-year interval. Overall, these findings indicate that within a temporal framework of 1 year, HCCs may be stable predictors in correlational studies where the focus is on the rank orders of measured values.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Hydrocortisone
/
Hair
Limits:
Adult
/
Female
/
Humans
Language:
En
Journal:
Stress Health
/
Stress and health (Online)
/
Stress health (Online)
Year:
2024
Document type:
Article
Affiliation country:
Country of publication: