Table 4 Mediation analysis

Model 1: Cigarette dependence score as the dependent variable

Effect of parental divorce on the mediating variable

Effect of parental divorce and the mediating variable on cigarette dependence

The direct effect of parental divorce on cigarette dependence

Mediating effect of the mediator

Beta

t

p

95% BCa CI

Beta

t

p

95% BCa CI

Beta

t

p

95% BCa CI

Parental divorce

-0.43

-0.67

0.502

-1.67

0.82

2.68

13.25

 < 0.001

2.28

3.07

2.65

12.93

 < 0.001

2.25

3.05

-

Anxiety

0.06

7.24

 < 0.001

0.04

0.07

Parental divorce

-4.71

-5.10

 < 0.001

-6.53

-2.90

2.85

13.84

 < 0.001

2.44

3.25

2.70

13.12

 < 0.001

2.30

3.11

5.06%

Insomnia

0.03

5.63

 < 0.001

0.02

0.04

Parental divorce

2.05

15.92

 < 0.001

1.79

2.30

1.27

6.40

 < 0.001

0.88

1.66

2.74

13.27

 < 0.001

2.34

3.15

115.08%

Suicidal ideation

0.72

20.00

 < 0.001

0.65

0.79

Parental divorce

-0.29

-1.86

0.063

-0.59

0.02

2.72

13.40

 < 0.001

2.32

3.12

2.68

13.12

 < 0.001

2.28

3.08

-

Depression

0.15

4.59

 < 0.001

0.08

0.21

Model 2: Waterpipe dependence score as the dependent variable

Effect of parental divorce on the mediating variable

Effect of parental divorce and the mediating variable on waterpipe dependence

The direct effect of parental divorce on waterpipe dependence

Mediating effect of the mediator

Parental divorce

-0.43

-0.67

0.502

-1.68

0.82

5.65

9.37

 < 0.001

4.47

6.83

5.50

8.51

 < 0.001

4.23

6.76

-

Anxiety

0.36

15.55

 < 0.001

0.32

0.41

Parental divorce

-4.72

-5.11

 < 0.001

-6.53

-2.90

6.16

9.53

 < 0.001

4.89

7.42

5.59

8.60

 < 0.001

4.32

6.87

9.19%

Insomnia

0.12

7.04

 < 0.001

0.09

0.15

Parental divorce

2.05

15.92

 < 0.001

1.79

2.30

1.91

2.88

0.004

0.61

3.21

5.53

8.43

 < 0.001

4.24

6.81

189.74%

Suicidal ideation

1.77

14.83

 < 0.001

1.54

2.00

Parental divorce

-0.29

-1.86

0.064

-0.59

0.02

5.86

9.32

 < 0.001

4.62

7.09

5.60

8.72

 < 0.001

4.34

6.86

-

Depression

0.89

8.95

 < 0.001

0.69

1.08