Table 4 Results of the multiple mediation model for sleep irregularity regarding depression and anxiety

Partial effects of covariates on stress response

　Stressor

1.07

.24

4.39**

.96

.24

4.07**

　Optimism

− .56

.10

− 5.61**

− .20

.10

− 2.06*

Effects of sleep irregularity on mediators

　Commitment

.38

.05

8.17**

.38

.05

8.17**

　Appraisal of influence

.02

.04

.51

.02

.04

.51

　Appraisal of threat

.48

.06

8.58**

.48

.06

8.58**

　Controllability

− .28

.04

− 7.30**

− .28

.04

− 7.30**

Direct mediating effects on stress response

　Commitment

.10

.08

1.28

.29

.08

3.66**

　Appraisal of influence

.13

.09

1.54

.06

.08

.75

　Appraisal of threat

.12

.07

1.76

− .15

.06

− 2.26*

　Controllability

.00

.08

.03

− .04

.08

− .50

Effects of sleep irregularity on stress response

　Total

.12

.05

2.24*

.06

.05

1.10

　Direct

.03

.07

.40

.01

.06

.12

Indirect effects

b

SE

95% BCa CI

b

SE

95% BCa CI

　Total

.10

.04

(.02; .18)

.05

.04

(− .02; .13)

　Commitment

.04

.03

(− .02; .10)

.11

.03

(.05; .18)

　Appraisal of Influence

.00

.01

(− .01; .02)

.00

.00

(− .01; .01)

　Appraisal of threat

.06

.03

(− .00; .12)

− .07

.03

(− .14; − .01)

　Controllability

.00

.03

(− .05; .05)

.01

.03

(− .04; .07)

Model statistics

R

R²

F _{(7, 279)}

R

R²

F _{(7, 279)}

.52

.27

14.51**

.39

.15

7.15**