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.
摘要:
就乘积矩相关性而言,先前已发现人头发皮质醇浓度(HCC)在1年间隔内高度稳定(r=0.73)。本研究旨在复制这一发现,并比较HCC稳定性关于1年和2年测试间隔。女大学生(N=39)以1(n=21)或2年(n=18)的间隔提供了两次发束(t1和t2)。在t2预测HCC的多元回归分析显示了显着的相互作用项(在t1×时间间隔条件下的HCC)。已确定,在1年间隔内,HCC实质上相关,但在2年间隔内无关。这些发现不能归因于潜在的影响,如头发治疗。关于1年测试-重测间隔,乘积-矩相关性显示出与先前研究几乎相同的一致性。在2年的时间间隔内,没有显着的乘积矩相关性。总的来说,这些发现表明,在1年的时间框架内,在相关研究中,HCC可能是稳定的预测因子,重点是测量值的等级顺序。