Table 4 Job strain and social support scores and area under the curve with respect to ground (AUC_G) of salivary dehydroepiandrosterone (DHEA), cortisol and cortisol-to-DHEA ratio (C/D ratio): results of multiple linear regression analysis (n = 115).

AUC_G, log-transformed¹⁾	Job strain score		Social support score		Goodness of fit
AUC_G, log-transformed¹⁾	SPRC	P	SPRC	P	Adjusted R²	F	P
Model 1
DHEA	0.000	0.999	−0.340	<0.001²⁾	0.375	18.074	<0.001
Cortisol	−0.128	0.166	−0.205	0.033	0.055	2.663	0.036
C/D ratio	−0.138	0.112	0.130	0.147	0.169	6.788	<0.001
Model 2
DHEA	0.002	0.978	−0.343	<0.001²⁾	0.352	7.201	<0.001
Cortisol	−0.132	0.176	−0.181	0.084	0.008	1.094	0.374
C/D ratio	−0.145	0.111	0.155	0.111	0.136	2.787	0.004

SPRC: Standardized partial regression coefficient. In Model 1, the independent variables were job strain and social support scores, age and employment status (regular staff). The degree of freedom for F-value was 4, 110. In Model 2, the independent variables additionally included current smoking, menstruation irregularity, ovulatory phase, musculoskeletal symptoms, dental and gum diseases and other health problems. The degree of freedom for F-value was 10, 104.
¹⁾AUC_G was log-transformed for normality.
²⁾Statistical significance remained (p < 0.001) even when log-transformed AUC_G of salivary cortisol was additionally adjusted (see Supplementary Table S3).

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