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Table 4 Results of multiple logistic regression for frequent voice disorder (fVD): secondary school teachers

From: Effect of teacher’s working conditions on voice disorder in Korea: a nationwide survey

General and work-related factors Total Female
aORa 95% CI aORb 95% CI
School type
Middle 1.27 (0.63–2.59) 1.41 (0.61–3.42)
General high 0.99 (0.50–2.01) 1.03 (0.43–2.60)
Vocational high 1   1  
Age (yrs)
 < 30 1   1  
 30–39 1.49 (0.54–4.82) 1.38 (0.50–4.61)
 40–49 1.47 (0.52–4.89) 0.98 (0.31–3.44)
 ≥ 50 1.87 (0.68–6.14) 1.87 (0.64–6.40)
Sex
Male 1   
 Female 3.04 (1.42–7.26)c  
Smoking status
 Never smoker 1   
 Ex-smoker 0.55 (0.18–1.59)  
 Current smoker 0.96 (0.30–2.91)  
Sleep hours (hrs/day)
 < 6 1.42 (0.71–2.82) 1.15 (0.52–2.51)
 6–7 1.18 (0.66–2.17) 0.96 (0.49–1.91)
 ≥ 7 1   1  
Class hours (hrs/wk)
 < 16 1   1  
 16–19 1.33 (0.66–2.94) 1.65 (0.68–4.66)
 ≥ 20 1.90 (0.80–4.73) 2.37 (0.82–7.58)
Working hours (hrswk)
 40 1   1  
 41–52 0.96 (0.49–1.98) 0.98 (0.46–2.19)
 > 52 1.03 (0.38–2.73) 0.94 (0.28–3.01)
Homeroom teacher
 Yes 1.52 (0.90–2.62) 1.85 (0.98–3.60)
 No 1   1  
Subject
 Physical education 1.03 (0.16–3.95)  
 Music 0.60 (0.09–2.39)  
 Others 1   
Sick leave as needed
 Yes 1   1  
 No 2.40 (1.41–4.16)c 1.93 (1.03–3.73)c
  1. aOR adjusted odds ratio, 95% CI 95% confidence interval
  2. aAdjusted for school type, age, sex, smoking, region, number of students, sleep hours, class hours, working hours, homeroom teacher, subject, and sick leave as needed
  3. bAdjusted for school type, age, region, number of students, sleep hours, class hours, working hours, homeroom teacher, and sick leave as needed
  4. cStatistically significant (P < 0.05)