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Table 4 Odds ratios of cardiovascular disease associated with cumulative night work

From: Association between night work and cardiovascular diseases: analysis of the 3rd Korean working conditions survey

 

Model 1

Model 2

Model 3

Model 4

OR

95% CI

OR

95% CI

OR

95% CI

OR

95% CI

Cardiovascular diseases

Reference group

1.00

 

1.00

 

1.00

 

1.00

 

Low risk group (<360)

1.26

0.82 - 1.93

1.25

0.81 - 1.94

1.23

0.79 - 1.90

1.34

0.84 - 2.14

High risk group (≥360)

2.10

1.51 - 2.92

1.58

1.12 - 2.22

1.56

1.11 - 2.20

1.81

1.19 - 2.74

  1. OR, odds ratio; CI, confidence interval.
  2. Model 1: odds ratio by independent univariate logistic regression analysis.
  3. Model 2: multivariate logistic regression analysis, model 1 + sex (male or female), age (<30 years, 30-39 years, 40-49 years, 50-59 years, or ≥60 years, level of education completed (middle school or below, high school, or college or above), monthly income (<1,000,000 won, 1,000,000 – 2,000,000 won, 2,000,000 – 3,000,000 won, or ≥3,000,000 won).
  4. Model 3: multivariate logistic regression analysis, model 2 + smoking (non-smoker, ex-smoker or current smoker), and drinking frequency (none, ≤1 per week, ≥2 per week).
  5. Model 4: multivariate logistic regression analysis, model 3 + job type (white collar, service, or blue collar), company size by number of employees (<5, 5-49, 50-299, or ≥300), shift work (yes or no), and working time (<40 hours a week, 40-48 hours a week, 49-60 hours a week, or ≥61 hours a week).