Table 2 Adjusted Odds ratios (OR) and 95% confidence intervals (CI) from full multinomial logistic regression for the relation between the covariates and self-reported sleep hours in Iranian adults—Ravansar Non-Communicable Disease (RaNCD) cohort study

Age (years)

  ≤ 50

1

1

 51–60

1.46

1.26–1.70

0.75

0.66–0.85

  ≥ 60

1.71

1.38–2.11

0.78

0.66–0.93

Gender (male gender is reference)

1.33

1.09–1.62

1.16

1.00–1.36

Education

 Lower than diploma

1

1

 diploma

1.12

0.88–1.41

0.82

0.67–0.99

 Higher than diploma

1.04

0.77–1.40

0.40

0.30–0.52

Marital status (married is ref)

1.31

1.05–1.63

1.13

0.96–0.133

Residence (urban is ref)

0.88

0.76–1.01

1.31

1.18–1.45

Wealth index status

 The poorest

1

1

 Second poor

1.12

0.92–1.36

0.93

0.80–1.08

 Middle

0.97

0.79–1.19

0.82

0.70–0.95

 Second rich

0.92

0.74–1.13

0.65

0.55–0.76

 The richest

0.85

0.66–1.08

0.68

0.57–0.83

Mobile use time (hours)

  < 3^a

1

1

 3–7.9

1.13

0.95–1.35

0.96

0.84–1.09

  ≥ 8

1.31

1.05–1.64

0.94

0.79–1.12

Night shift workers

1.34

1.10–1.64

0.79

0.65–0.94

BMI (kg/m2)

  < 25^a

1

1

 25–29.9

1.01

0.85–1.16

0.97

0.86–1.09

  ≥ 30

1.21

1.02–1.45

0.87

0.76–1.01

Physical activity

 Low^a

1

1

 Moderate

1.48

1.24–1.76

0.45

0.40–0.51

 Good

2.18

1.78–2.66

0.29

0.25–0.35

Smoking status

 Nonsmokers ^a

1

1

 Current smokers

1.14

0.93–1.41

1.00

0.83–1.19

 Past smokers

1.31

1.05–1.63

1.01

0.82–1.22

Alcohol use

1.46

1.14–1.87

0.86

0.67–1.09

Depression

0.74

0.53–1.04

0.87

0.65–1.13

Cardiovascular diseases

1.17

0.96–1.44

0.94

0.78–1.11

Hypertension

0.91

0.74–1.11

0.86

0.72–1.01

Diabetes

1.17

0.93–1.46

1.23

1.02–1.47