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Table 1 General characteristics 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)  
School type
 Primary 558 (100) 71 (12.7)  
 Middle   196 (26.4) 30 (15.3) 0.031
 General high   317 (42.7) 33 (10.4)  
 Vocational high   230 (30.9) 17 (7.4)  
Region
 Urban 326 (58.4) 46 (14.1) 0.244 460 (61.9) 50 (10.9) 0.909
 Rural 232 (41.6) 25 (10.8)   283 (38.1) 30 (10.6)  
Teaching career (yrs)
 < 5 85 (15.2) 14 (16.5) 0.343 87 (11.7) 12 (13.8) 0.504
 5–14 166 (29.8) 24 (14.5)   174 (23.4) 22 (12.6)  
 15–24 190 (34.0) 18 (9.5)   166 (22.4) 17 (10.2)  
 ≥ 25 117 (21.0) 15 (12.8)   316 (42.5) 29 (9.2)  
Age (yrs)
 < 30 85 (15.2) 14 (16.5) 0.395 47 (6.3) 5 (10.6) 0.368
 30–39 176 (31.5) 25 (14.2)   175 (23.5) 25 (14.3)  
 40–49 195 (35.0) 19 (9.7)   184 (24.8) 19 (10.3)  
 ≥ 50 102 (18.3) 13 (12.8)   337 (45.4) 31 (9.2)  
Sex
 Male 113 (20.3) 6 (5.3) 0.008 399 (53.7) 19 (4.8) <.001
 Female 445 (79.7) 65 (14.6)   344 (46.3) 61 (17.7)  
Smoking status
 Never smoker 501 (89.8) 67 (13.4) 0.394 479 (64.5) 68 (14.2) <.001
 Ex-smoker 28 (5.0) 2 (7.2)   162 (21.8) 6 (3.7)  
 Current smoker 29 (5.2) 2 (6.9)   102 (13.7) 6 (5.9)  
Sleep hours (hrs/day)
 < 6 67 (12.0) 13 (19.4) 0.058 155 (20.9) 21 (13.6) 0.393
 6–7 212 (38.0) 31 (14.6)   359 (48.3) 38 (10.6)  
 ≥ 7 279 (50.0) 27 (9.7)   229 (30.8) 21 (9.2)  
  1. *by Chi-square test, Statistically significant (P - value < 0.05)