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Table 2 General characteristics of study subjects among non-depressed group at baseline

From: Effects of changes in occupational stress on the depressive symptoms of Korean workers in a large company: a longitudinal survey

  Total Non-depressed group (n = 512, 100.0%) Non-depressed-maintained group (n = 333, 65.0%) Non-depressed-deteriorated group (n = 179, 35.0%) p-value
N (%) or M ± SD N (%) or M ± SD N (%) or M ± SD  
Sex
 Male 428 (83.6%) 286 (66.8%) 142 (33.2%) 0.056
 Female 84 (16.4%) 47 (56.0%) 37 (44.0%)  
Age (year)
  28.21 ± 2.70 28.20 ± 2.67 28.22 ± 2.78 0.929
Smoking history
 Non smoker 297 (58.0%) 191 (64.3%) 106 (35.7%) 0.836
 Past smoker 75 (14.6%) 51 (68.0%) 24 (32.0%)  
 Current smoker 140 (27.3%) 91 (65.0%) 49 (35.0%)  
Heavy drinking
 No 423 (82.6%) 275 (65.0%) 148 (35.0%) 0.978
 Yes 89 (17.4%) 58 (65.2%) 31 (34.8%)  
Adequate physical activity
 No 343 (67.0%) 214 (62.4%) 129 (37.6%) 0.073
 Yes 169 (33.0%) 119 (70.4%) 50 (29.6%)  
Career (year)
  2.14 ± 1.39 2.19 ± 1.37 2.05 ± 1.44 0.272
Working hours (hours/week)
  ≤ 40 73 (14.3%) 52 (71.2%) 21 (28.8%) 0.305
 41~ 50 249 (48.6%) 166 (66.7%) 83 (33.3%)  
 51~ 60 145 (28.3%) 86 (59.3%) 59 (40.7%)  
  ≥ 61 45 (8.8%) 29 (64.4%) 16 (35.6%)  
Job task
 Office 445 (86.9%) 284 (63.8%) 161 (36.2%) 0.136
 Labor/Service 67 (13.1%) 49 (73.1%) 18 (26.9%)  
Education
  ≤ College 417 (81.4%) 268 (64.3%) 149 (35.7%) 0.444
  ≥ Master degree 95 (18.6%) 65 (68.4%) 30 (31.6%)  
Marital status
 Unmarried/Divorced 384 (75.0%) 247 (64.3%) 137 (35.7%) 0.556
 Married 128 (25.0%) 86 (67.2%) 42 (32.8%)  
Occupational Stress
 1st quartile 201 (39.3%) 150 (74.6%) 51 (25.4%) < 0.001
 2nd quartile 161 (31.4%) 104 (64.6%) 57 (35.4%)  
 3rd quartile 97 (18.9%) 51 (52.6%) 46 (47.4%)  
 4th quartile 53 (10.4%) 28 (52.8%) 25 (47.2%)  
 Total score 36.68 ± 10.30 35.20 ± 10.56 39.45 ± 9.22 < 0.001
Occupational stress sub-domains score
 Job demand 46.50 ± 16.41 44.84 ± 16.49 49.58 ± 15.83 0.002
 Insufficient job control 45.25 ± 14.11 44.02 ± 14.47 47.53 ± 13.15 0.007
 Interpersonal conflict 29.56 ± 13.63 28.66 ± 14.57 31.22 ± 11.53 0.030
 Job insecurity 30.14 ± 20.45 28.48 ± 20.43 33.24 ± 20.18 0.012
 Organizational system 38.75 ± 14.74 37.29 ± 15.18 41.48 ± 13.51 0.002
 Lack of reward 37.17 ± 13.73 35.20 ± 13.51 40.84 ± 13.41 < 0.001
 Occupational climate 29.41 ± 15.96 27.88 ± 16.15 32.26 ± 15.22 0.003