Table 2.

Multiple linear regression results of HCC for all participants

Independent variable	B	95% confidence interval	p
(Constant)	7.471	[5.942, 9.000]	< 0.001
Sex	0.248	[0.013, 0.484]	0.039
Age	0.008	[− 0.038, 0.054]	0.721
K-SRRS	0.042	[− 0.040, 0.123]	0.314
PSS	− 0.024	[− 0.051, 0.003]	0.086
BDI	− 0.023	[− 0.145, 0.098]	0.704
SAI	0.017	[− 0.002, 0.037]	0.074
TAI	− 0.013	[− 0.040, 0.014]	0.353
DERS	0.012	[0.003, 0.021]	0.006

BDI Beck Depression Inventory, DERS Difficulty in Emotion Regulation Scale, HCC hair cortisol concentration, K-SRRS Korean version of the Social Readjustment Rating Scale, PSS Perceived Stress Scale, SAI State Anxiety Inventory, TAI Trait Anxiety Inventory