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Table 2 Working conditions and frequent voice disorder (fVD) of teachers

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

Variables Primary school Secondary school
N(%) fVD N(%) fVD
N (%) P-value* N (%) P-value*
Total 558 (100) 71 (12.7) 743 (100) 80 (10.8)
Number of students (N/class)
 < 22 115 (20.6) 11 (9.6) 0.651 57 (7.7) 8 (14.0) 0.249
 22–24 225 (40.3) 32 (14.2)   42 (5.7) 5 (11.9)  
 25–27 207 (43.4) 27 (13.0)   270 (36.3) 21 (7.8)  
 ≥ 28 11 (2.0) 1 (9.1)   374 (50.3) 46 (12.3)  
Class hours (hrs/wk)
 < 16 32 (5.7) 2 (6.3) 0.566 153 (20.6) 10 (6.5) 0.060
 16–19 33 (5.9) 5 (15.2)   457 (61.5) 49 (10.7)  
 20–23 415 (74.4) 56 (13.5)   129 (17.4) 21 (16.3)  
 ≥ 24 78 (14.0) 8 (10.3)   4 (0.5) 0 (0)  
Working hours (hrs/wk)
 40 213 (38.2) 20 (9.4) 0.034 125 (16.8) 13 (10.4) 0.988
 41–52 323 (57.9) 45 (13.9)   518 (69.7) 56 (10.8)  
 > 52 22 (3.9) 6 (27.3)   100 (13.5) 11 (11.0)  
Homeroom teacher
 Yes 460 (82.4) 57 (12.4) 0.609 404 (54.4) 53 (13.1) 0.024
 No 98 (17.6) 14 (14.3)   339 (45.6) 27 (8.0)  
Subject
 Physical education 18 (3.3) 1 (5.6) 0.003 29 (3.9) 2 (6.9) 0.789
 Music 11 (2.0) 5 (45.5)   19 (2.6) 2 (10.5)  
 Others 521 (94.7) 65 (12.3)   690 (93.5) 76 (11.0)  
Sick leave as needed
 Yes 295 (52.9) 27 (9.2) 0.007 417 (56.1) 26 (6.2) <.001
 No 263 (47.1) 44 (16.7)   326 (43.9) 54 (16.6)  
Employment status
 Regular 540 (96.8) 67 (12.4) 0.219 638 (85.9) 70 (11.0) 0.657
 Part-time 18 (3.2) 4 (22.2)   105 (14.1) 10 (9.5)  
  1. *by Chi-square test, Statistically significant (P - value < 0.05)