Table 2. Spearman’s correlation coefficients among the four items for psychological characteristics.

Psychological traits	Questions	“Ikigai”	Decisiveness	Ease of anger arousal	Psychological stress
“Ikigai”	(Do you have “ikigai”?)	—	0.29 (0.28, 0.30)	−0.08 (−0.09, −0.07)	−0.15 (−0.16, −0.13)
Decisiveness	(Do you make decisions quickly?)	—	—	0.03 (0.02, 0.04)	−0.04 (−0.05, −0.02)
Ease of anger arousal	(Are you easily angered?)	—	—	—	0.33 (0.32, 0.34)
Psychological stress of daily life	(Do you experience stress during your daily life?)	—	—	—	—

95% CI was estimated using Fisher’s Z transformation, and is shown in parentheses.