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Table 3 Multivariable model describing the factors associated with duration of sick leave in the 4 months during the first wave of the COVID-19 pandemic, including subgroup of individuals with COVID-19 virus not identified, n = 3682

From: Impact of pre-pandemic sick leave diagnoses on the length of COVID-19-related sick leave: a nationwide registry-based study

Factors

β [SE]

OR [95% CI]

p-value

Intercept of the multivariable model

3.72 [0.05]

41.1 [37.4–45.3]

0.000

Diagnostic groups in the year before the COVID-19, Ref. No prior sick leave

 Mental, behavioural, and neurodevelopmental disorders

0.03 [0.05]

1.03 [0.94–1.14]

0.507

 Musculoskeletal system and connective tissue diseases

0.03 [0.05]

1.03 [0.94–1.14]

0.517

 Respiratory system diseases

0.19 [0.05]

1.21 [1.09–1.35]

 < 0.001

 All other isolated diagnoses

0.04 [0.04]

0.04 [0.96–1.13]

0.355

 Multiple diagnoses

0.26 [0.06]

1.29 [1.15–1.46]

 < 0.001

Education. Ref. primary school (≤ 9 years)

 Secondary school (10–12 years)

 − 0.03 [0.03]

0.97 [0.92–1.03]

0.350

 Short university education (13–14 years)

0.03 [0.03]

1.03 [0.96–1.10]

0.465

 Long university education (≥ 15 years)

0.06 [0.03]

1.06 [1.00–1.13]

0.067

Civil status. Ref. married

 Single

0.03 [0.02]

1.03 [0.99–1.08]

0.099

 Divorced

0.03 [0.02]

1.03 [0.99–1.08]

0.161

 Widow/widower

0.15 [0.08]

1.17 [1.01–1.36]

0.046

Employment status. Ref. employed

 Self-employed

0.07 [0.05]

1.07 [0.97–1.19]

0.186

 Unemployed

 − 0.12 [0.07]

0.89 [0.78–1.01]

0.070

 Female sex

0.06 [0.02]

1.06 [1.02–1.09]

0.002

 Age, per gained year (range 18–76 years)

0.001 [0.000]

.001 [1.000–1.002]

0.534

 Sick leave ≥ 28 days in the year before the COVID-19

0.05 [0.04]

1.06 [0.97–1.14]

0.190

  1. Statistics: negative binomial regression, multivariable analysis. Bold text indicates statistically significant results at an alpha of 5%
  2. Abbreviations: COVID-19 coronavirus disease, β [SE], regression coefficient with standard error, OR odds ratio, CI confidence interval
  3. Model metrics: The Akaike information criteria, 33,068; log-likelihood test: -16,516; omnibus test, p 0.001