Table 4.
Results of multiple logistic regression for frequent voice disorder (fVD): secondary school teachers
| 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 |
aOR adjusted odds ratio, 95% CI 95% confidence interval
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
bAdjusted for school type, age, region, number of students, sleep hours, class hours, working hours, homeroom teacher, and sick leave as needed
cStatistically significant (P < 0.05)