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Table 3 Results of multiple logistic regression for frequent voice disorder (fVD): primary 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
Age (yrs)
 < 30 1   1  
 30–39 0.98 (0.46–2.12) 0.84 (0.39–1.88)
 40–49 0.56 (0.26–1.26) 0.53 (0.24–1.20)
 ≥ 50 0.79 (0.33–1.90) 0.66 (0.27–1.63)
Sex
 Male 1   
 Female 2.78 (1.01–9.66)c  
Smoking status
 Nerver smoker 1   
 Ex-smoker 1.14 (0.16–5.05)  
 Current smoker 1.31 (0.17–6.99)  
Sleep hours (hrs/day)
 < 6 2.24 (1.03–4.77)c 2.34 (1.03–5.14)c
 6–7 1.69 (0.93–3.05) 1.69 (0.91–3.13)
 ≥ 7 1   1  
Class hours (hrs/wk)
 < 20 1   1  
 20–23 1.40 (0.53–4.17) 1.61 (0.57–5.25)
 ≥ 24 1.26 (0.35–4.56) 1.40 (0.36–5.67)
Working hours (hrs/wk)
 40 1   1  
 41–52 1.25 (0.69–2.33) 1.21 (0.65–2.34)
 > 52 2.72 (0.83–8.10) 2.42 (0.67–7.87)
Homeroom teacher
 Yes 0.94 (0.40–2.45) 0.80 (0.33–2.12)
 No 1   1  
Subject
 Physical education 0.72 (0.04–4.95) 1.27 (0.06–10.31)
 Music 6.76 (1.52–30.75)c 4.66 (0.93–22.94)
 Others 1   1  
Sick leave as needed
 Yes 1   1  
 No 1.71 (1.00–2.98)c 1.76 (1.00–3.16)c
  1. aOR adjusted odds ratio, 95% CI 95% confidence interval
  2. aAdjusted for age, sex, smoking, region, number of students, sleep hours, class hours, working hours, homeroom teacher, subject, and sick leave as needed
  3. bAdjusted for age, region, number of students, sleep hours, class hours, working hours, homeroom teacher, subject, and sick leave as needed
  4. cStatistically significant (P < 0.05)