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Table 1 General characteristics of total study subjects between non-depressed group and 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 study subjects (n = 1036, 100.0%) Non-depressed group (n = 512, 49.4%) Depressed group (n = 524, 50.6%) p-value
N (%) or M ± SD N (%) or M ± SD N (%) or M ± SD
Sex
 Male 843 (81.4%) 428 (50.8%) 415 (49.2%) 0.069
 Female 193 (18.6%) 84 (43.5%) 109 (56.5%)  
Age (year)
  28.25 ± 2.82 28.21 ± 2.70 28.30 ± 2.93 0.620
Smoking history
 Non smoker 589 (56.9%) 297 (50.4%) 292 (49.6%) 0.745
 Past smoker 158 (15.3%) 75 (47.5%) 83 (52.5%)  
 Current smoker 289 (27.9%) 140 (48.4%) 149 (51.6%)  
Heavy drinking
 No 847 (81.8%) 423 (49.9%) 424 (50.1%) 0.478
 Yes 189 (18.2%) 89 (47.1%) 100 (52.9%)  
Adequate physical activity
 No 744 (71.8%) 343 (46.1%) 401 (53.9%) 0.001
 Yes 292 (28.2%) 169 (57.9%) 123 (42.1%)  
Career (year)
  2.26 ± 1.32 2.14 ± 1.39 2.37 ± 1.23 0.005
Working hours (hours/week)
  ≤ 40 122 (11.8%) 73 (59.8%) 49 (40.2%) < 0.001
 41~ 50 432 (41.7%) 249 (57.6%) 183 (42.4%)  
 51~ 60 351 (33.9%) 145 (41.3%) 206 (58.7%)  
  ≥ 61 131 (12.6%) 45 (34.4%) 86 (65.6%)  
Job task
 Office 886 (85.5%) 445 (50.2%) 441 (49.8%) 0.208
 Labor/Service 150 (14.5%) 67 (44.7%) 83 (55.3%)  
Education
  ≤ College 840 (81.1%) 417 (49.6%) 423 (50.4%) 0.767
  ≥ Master degree 196 (18.9%) 95 (48.5%) 101 (51.5%)  
Marital status
 Unmarried/Divorced 793 (76.5%) 384 (48.4%) 409 (51.6%) 0.271
 Married 243 (23.5%) 128 (52.7%) 115 (47.3%)  
Occupational stress
 1st quartile 256 (24.7%) 201 (78.5%) 55 (21.5%) < 0.001
 2nd quartile 269 (26.0%) 161 (59.9%) 108 (40.1%)  
 3rd quartile 251 (24.2%) 97 (38.6%) 154 (61.4%)  
 4th quartile 260 (25.1%) 53 (20.4%) 207 (79.6%)  
 Total score 41.72 ± 11.33 36.68 ± 10.30 46.63 ± 10.07 < 0.001
Occupational stress sub-domains score
 Job demand 52.15 ± 17.58 46.50 ± 16.41 57.67 ± 16.95 < 0.001
 Insufficient job control 48.32 ± 14.94 45.25 ± 14.11 51.32 ± 15.13 < 0.001
 Interpersonal conflict 33.68 ± 14.46 29.56 ± 13.63 37.70 ± 14.12 < 0.001
 Job insecurity 35.60 ± 21.94 30.14 ± 20.45 40.94 ± 22.06 < 0.001
 Organizational system 43.32 ± 16.70 38.75 ± 14.74 47.77 ± 17.29 < 0.001
 Lack of reward 43.85 ± 16.32 37.17 ± 13.73 50.38 ± 16.01 < 0.001
 Occupational climate 35.10 ± 17.32 29.41 ± 15.96 40.66 ± 16.79 < 0.001