Table 3 Interaction between sleeping characteristics and the factors in association with NAFLD using likelihood ratio test

Sleep duration

Male

-

-

0.92–1.03

0.78

Female

-

-

0.94–1.03

Age ≤ 40

-

-

0.89–1.10

0.25

Age 40–60

-

-

0.95–1.03

Age ≥ 60

-

-

0.84–1.00

BMI ≤ 25

-

-

0.83–1.00

0.17

BMI 25–30

-

-

0.89–1.02

BMI ≥ 30

-

-

0.95–1.08

Wake up time category (hour) (≤ 6 a.m.)

Male

-

-

0.71–1.01

0.20

Female

-

-

0.86–1.11

Age ≤ 40

-

-

0.69–1.29

0.23

Age 40–60

-

-

0.86–1.09

Age ≥ 60

-

-

0.58–0.98

BMI ≤ 25

-

-

0.78–1.48

0.62

BMI 25–30

-

-

0.80–1.08

BMI ≥ 30

-

-

0.78–1.05

Bed time category (hour) (≤ 10 p.m.)

Male

-

-

0.58–0.93

0.03

Female

-

-

0.85–1.15

Age ≤ 40

-

-

0.88–1.83

0.02

Age 40–60

-

-

0.80–1.09

Age ≥ 60

-

-

0.49–0.90

BMI ≤ 25

-

-

0.50–1.11

0.59

BMI 25–30

-

-

0.75–1.12

BMI ≥ 30

-

-

0.77–1.12

Sleep efficiency

Male

-

-

0.83–0.96

0.26

Female

-

-

0.89–0.99

Age ≤ 40

-

-

0.97–1.04

 < 0.001

Age 40–60

-

-

0.82–0.94

Age ≥ 60

-

-

0.70–0.93

BMI ≤ 25

-

-

0.98–1.04

0.01

BMI 25–30

-

-

0.86–0.99

BMI ≥ 30

-

-

0.84–0.94

Day time nap (yes)

Male

2622

470

1.05–1.53

0.007

Female

2380

326

0.83–1.06

Age ≤ 40

910

104

0.79–1.42

0.87

Age 40–60

3369

579

0.90–1.15

Age ≥ 60

723

113

0.84–1.43

BMI ≤ 25

1290

85

0.90–1.71

 < 0.001

BMI 25–30

2297

396

1.10–1.52

BMI ≥ 30

1413

315

0.70–0.94

Restless legs syndrome

Male

652

142

0.74–1.25

0.29

Female

459

53

0.69–0.95

Age ≤ 40

162

16

0.62–1.68

0.71

Age 40–60

770

150

0.71–0.97

Age ≥ 60

179

29

0.61–0.94

BMI ≤ 25

282

15

0.65–1.90

0.53

BMI 25–30

490

89

0.66–0.99

BMI ≥ 30

339

91

0.70–1.03

Use of sleeping pills

Male

340

93

0.95–2.43

0.60

Female

151

24

1.35–2.29

Age ≤ 40

53

9

0.81–3.76

0.98

Age 40–60

237

83

1.30–2.25

Age ≥ 60

111

25

0.99–2.69

BMI ≤ 25

124

11

0.73–2.81

0.86

BMI 25–30

212

50

1.23–2.42

BMI ≥ 30

155

56

1.23–2.49