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Table 2 Baseline characteristics, total scoring of K6 points, and negative life events according to region on The Japan Environment and Children Study

From: The prevalence of psychological distress during pregnancy in Miyagi Prefecture for 3 years after the Great Eas t Japan Earthquake

  13 RCs Miyagi RC p value Inland Coast p value
N 67,882 8270   5015 3255  
Age    < 0.001    < 0.001
 ≤ 24 years 8.91 14.44   15.11 13.39  
 25–34 years 62.64 64.35   65.42 62.70  
 30–34 years 28.45 21.16   19.42 23.84  
 Missing 0.00 0.05   0.04 0.06  
Parity    < 0.001    < 0.001
 Primipara 38.97 38.97   38.70 39.39  
 Multipara 58.21 60.04   60.34 59.57  
 Missing 2.82 0.99   0.96 1.04  
Marital status    < 0.001    < 0.001
 Married 95.34 94.35   94.50 94.13  
 Other 4.20 5.26   5.08 5.53  
 Missing 0.46 0.39   0.42 0.34  
Family income    < 0.001    < 0.001
 ≤ 199 × 104 JPY 5.28 6.72   6.42 7.19  
 200–399 × 104 JPY 31.69 35.63   33.98 38.19  
 400–599 × 104 JPY 31.67 26.14   25.60 26.97  
 ≥ 600 × 104 JPY 25.53 20.53   21.14 19.61  
 Missing 5.84 10.97   12.86 8.05  
Education level    < 0.001    < 0.001
 Maternal       
  Junior high school 7.29 8.60   8.37 8.94  
  Senior high school 33.24 51.45   51.15 51.92  
  College 58.46 39.07   39.56 38.31  
  Missing 1.01 0.88   0.92 0.83  
 Paternal    < 0.001    < 0.001
  Junior high school 4.84 5.48   5.40 5.59  
  Senior high school 28.24 47.32   48.10 46.11  
  College 66.53 46.88   46.16 47.99  
  Missing 0.39 0.33   0.34 0.31  
Body mass index    < 0.001    < 0.001
 < 18.5 kg/m2 16.50 13.98   14.06 13.86  
 18.5–24.9 kg/m2 72.51 71.86   71.98 71.71  
 ≥ 25 kg/m2 9.61 14.14   13.94 14.44  
 Missing 1.38 0.01   0.02 0.00  
  13 RCs Miyagi RC p value Inland Coast p value
n 67,882 8270   5015 3255  
Smoking       
 Maternal    < 0.001    < 0.001
  Yes 4.50 6.25   5.94 6.73  
  No 94.68 92.96   93.10 92.75  
  Missing 0.82 0.79   0.96 0.52  
 Paternal    < 0.001    < 0.001
  Yes 43.43 59.77   59.58 60.06  
  No 54.83 38.86   39.06 38.56  
  Missing 1.74 1.37   1.36 1.38  
Alcohol intake    < 0.001    <0.001
 Yes 3.01 2.54   2.71 2.27  
 No 96.04 97.39   97.21 97.67  
 Missing 0.95 0.07   0.08 0.06  
Feeling toward this pregnancy    < 0.001    < 0.001
 Uneasy 7.45 8.98   8.91 9.06  
 Other 92.22 90.83   90.95 90.66  
 Missing 0.34 0.19   0.14 0.28  
Past history of mental illness    0.4671    0.650
 Yes 7.75 7.52   7.66 7.31  
 No 92.25 92.48   92.34 92.69  
Fetal number    0.1027    0.0418
 Singleton 99.04 99.23   99.39 98.98  
 Multiple 0.96 0.77   0.61 1.02  
Number of times participating in JECS    < 0.001    < 0.001
 1 95.43 94.35   93.32 95.94  
 2 4.54 5.60   6.62 4.02  
 3 0.03 0.05   0.06 0.03  
Total scoring of K6 points    < 0.001    < 0.001
 ≤ 4 78.22 73.37   72.86 74.16  
 5–9 15.08 17.25   16.94 17.74  
 10–12 3.41 4.43   4.80 3.86  
 ≥ 13 3.29 4.95   5.41 4.23  
  13 RCs Miyagi RC p value Inland Coast p value
n 67,882 8270   5015 3255  
Negative life events*1    < 0.001    < 0.001
 Yes 42.28 48.14   45.98 51.49  
 No 56.97 51.53   53.60 48.33  
 Missing 0.75 0.33   0.42 0.18  
Classification of negative life events       
 Bereavement       
  Close blood relative 2.28 3.08 0.0862 2.37 4.15 0.082
  Close friend 0.97 2.27 < 0.001 1.24 3.87 < 0.001
 Injury and Illness       
  Close blood relative 15.43 13.50 0.034 13.91 12.85 0.042
 Dismissal       
  Self 1.07 1.75 < 0.001 1.56 2.06 < 0.001
  Husband 1.01 1.34 0.0051 1.12 1.69 < 0.001
 Enormous debt 0.90 0.70 0.0621 0.56 0.92 0.0396
 Change of family structure 3.61 8.14 <0.001 7.74 8.76 <0.001
 Change of residence 10.00 11.14 0.0012 9.97 12.93 <0.001
 Marital problems 10.02 10.27 0.4802 10.45 9.98 0.6161
 Divorce 0.32 0.27 0.3984 0.22 0.34 0.4501
  1. Miyagi RC (Regional Center) was combined with inland and coast
  2. 13RCs the 13 regional centers not including Miyagi RC and Fukushima RC
  3. *1 Negative life events in this survey refer to events within the past year at the time of answering the questions