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Table 1 Comparison for clinical characteristics, job stress, socioeconomic status between subjects with or without depressive mood

From: Folate intake and depressive symptoms in Japanese workers considering SES and job stress factors: J-HOPE study

  Total subjects (n = 2266) Subjects without depressive mood (n = 1771) Subjects with depressive mood (n = 495) P value
Age (year) 43.5 ± 9.8 44.0 ± 9.8 41.7 ± 9.3 <0.001**
Proportion of women (%) 10.6 11.0 9.3 0.273
Body mass index (kg/m2) 23.1 ± 3.3 23.0 ± 3.2 23.3 ± 3.5 0.209
Baseline characteristics
Systolic blood pressure (mmHg) 123.4 ± 16.1 123.7 ± 16.1 122.2 ± 16.0 0.081
Diastolic blood pressure (mmHg) 77.1 ± 12.0 77.1 ± 12.0 77.0 ± 11.9 0.760
Total cholesterol (mg/dL) 200.0 ± 35.1 200.2 ± 35.2 199.1 ± 34.5 0.582
Triglyceride (mg/dL) 125.8 ± 180.0 125.4 ± 195.3 127.4 ± 104.5 0.840
HDL cholesterol (mg/dL) 61.8 ± 16.5 62.0 ± 16.3 61.2 ± 17.4 0.424
Fasting plasma glucose (mg/dL) 95.0 ± 23.2 95.1 ± 21.7 94.9 ± 28.0 0.933
AST (IU/L) 23.7 ± 18.3 23.6 ± 19.7 24.0 ± 11.8 0.752
ALT (IU/L) 25.8 ± 18.1 25.5 ± 18.1 26.7 ± 18.0 0.245
γ-GTP (IU/L) 47.4 ± 56.8 47.1 ± 55.9 48.5 ± 60.2 0.676
SES factors
Years of education (year) 14.5 ± 2.5 14.6 ± 2.5 14.4 ± 2.5 0.320
Proportion of management position (%) 22.7 24.4 16.6 <0.001**
Years of continuous employment (year) 20.6 ± 11.6 21.1 ± 11.7 19.2 ± 11.1 0.001**
Working hours (hour/week) 46.6 ± 7.2 46.5 ± 7.1 47.0 ± 7.6 0.185
Annual household income (ten thousands yen/year) 704.4 ± 297.5 717.9 ± 303.3 656.3 ± 270.7 <0.001**
Adjusted annual household income (ten thousands yen/year) 443.0 ± 188.5 446.1 ± 188.7 431.8 ± 187.7 0.134
Number of families (n) 2.9 ± 1.4 2.9 ± 1.4 2.8 ± 1.5 0.018*
Job stress scores     
Job Demands 4.7 ± 2.5 4.5 ± 2.4 5.5 ± 2.6 <0.001**
Job Control 3.0 ± 1.4 3.0 ± 1.4 2.7 ± 1.4 <0.001**
Job Strain 4.0 ± 3.4 3.7 ± 3.1 5.2 ± 4.0 <0.001**
Worksite Support 11.8 ± 1.8 11.9 ± 1.6 11.3 ± 2.0 <0.001**
K6 Score 5.1 ± 4.6 3.2 ± 2.6 12.2 ± 3.3 <0.001**
Daily folate intake (μg/day) 295.6 ± 127.3 297.6 ± 125.9 288.5 ± 131.9 0.162
Energy-adjusted folate intake (μg/1000 kcal·day) 163.0 ± 56.9 165.0 ± 57.4 155.8 ± 54.7 0.001**
  1. Values are shown as mean ± standard deviation or percentage. Subjects with or without depressive mood were compared. Depressive symptom is defined as K6 score ≥9 in a 24-scoring system.
  2. Job strain ratio is defined as a ratio of job demands to job control followed by multiplied by 2. Worksite support score is calculated by adding the scores of supervisor support and colleague support.
  3. For continuous variables we used Student’s T test or Mann–Whitney U test. As to the categorized variables, we used χ2 test.
  4. *P <0.05; **P < 0.01.