Table 3.
Results of multiple logistic regression for frequent voice disorder (fVD): primary school teachers
| 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 |
aOR adjusted odds ratio, 95% CI 95% confidence interval
aAdjusted for age, sex, smoking, region, number of students, sleep hours, class hours, working hours, homeroom teacher, subject, and sick leave as needed
bAdjusted for age, region, number of students, sleep hours, class hours, working hours, homeroom teacher, subject, and sick leave as needed
cStatistically significant (P < 0.05)