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Table 4 General characteristics of study subjects among 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 Depressed group (n = 524, 100.0%) Depressed-maintained group (n = 394, 75.2%) Depressed-alleviated group (n = 130, 24.8%) p-value
N (%) or M ± SD N (%) or M ± SD N (%) or M ± SD
Sex
 Male 415 (79.2%) 310 (74.7%) 105 (25.3%) 0.611
 Female 109 (20.8%) 84 (77.1%) 25 (22.9%)  
Age (year)
  28.30 ± 2.93 28.23 ± 2.96 28.51 ± 2.84 0.342
Smoking history
 Non smoker 292 (55.7%) 218 (74.7%) 74 (25.3%) 0.611
 Past smoker 83 (15.8%) 60 (72.3%) 23 (27.7%)  
 Current smoker 149 (28.4%) 116 (77.9%) 33 (22.1%)  
Heavy drinking
 No 424 (80.9%) 315 (74.3%) 109 (25.7%) 0.327
 Yes 100 (19.1%) 79 (79.0%) 21 (21.0%)  
Adequate physical activity
 No 401 (76.5%) 302 (75.3%) 99 (24.7%) 0.908
 Yes 123 (23.5%) 92 (74.8%) 31 (25.2%)  
Career (year)
  2.37 ± 1.23 2.35 ± 1.25 2.45 ± 1.18 0.396
Working hours (hours/week)
  ≤ 40 49 (9.4%) 37 (75.5%) 12 (24.5%) 0.525
 41~ 50 183 (34.9%) 143 (78.1%) 40 (21.9%)  
 51~ 60 206 (39.3%) 154 (74.8%) 52 (25.2%)  
  ≥ 61 86 (16.4%) 60 (69.8%) 26 (30.2%)  
Job task
 Office 441 (84.2%) 329 (74.6%) 112 (25.4%) 0.473
 Labor/Service 83 (15.8%) 65 (78.3%) 18(21.7%)  
Education
  ≤ College 423 (80.7%) 313 (74.0%) 110 (26.0%) 0.195
  ≥ Master degree 101 (19.3%) 81 (80.2%) 20 (19.8%)  
Marital status
 Unmarried/Divorced 409 (78.1%) 312 (76.3%) 97 (23.7%) 0.275
 Married 115 (21.9%) 82 (71.3%) 33 (28.7%)  
Occupational Stress
 1st quartile 55 (10.5%) 42 (76.4%) 13 (23.6%) 0.834
 2nd quartile 108 (20.6%) 78 (72.2%) 30 (27.8%)  
 3rd quartile 154 (29.4%) 115 (74.7%) 39 (25.3%)  
 4th quartile 207 (39.5%) 159 (76.8%) 48 (23.2%)  
 Total score 46.63 ± 10.07 46.87 ± 10.39 45.92 ± 9.03 0.348
Occupational stress sub-domains score
 Job demand 57.67 ± 16.95 57.68 ± 16.92 57.63 ± 17.08 0.977
 Insufficient job control 51.32 ± 15.13 51.65 ± 15.31 50.32 ± 14.58 0.386
 Interpersonal conflict 37.70 ± 14.12 38.10 ± 14.38 36.50 ± 13.29 0.262
 Job insecurity 40.94 ± 22.06 40.23 ± 22.93 43.08 ± 19.11 0.163
 Organizational system 47.77 ± 17.29 48.20 ± 18.18 46.47 ± 14.26 0.324
 Lack of reward 50.38 ± 16.01 51.38 ± 16.33 47.35 ± 14.68 0.013
 Occupational climate 40.66 ± 16.79 40.86 ± 10.39 40.06 ± 15.84 0.639