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Table 3 Interannual change in psychological distress (K6 ≥ 13) on the coast, inland of Miyagi, and in the 13 RCs

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

   2011H1 2011H2 2012H1 2012H2 2013H1 2013H2 Chi-square p† Trend p
13 RCs(n = 67,882) %
(n)
2.74
(232/8463)
2.61
(270/10346)
3.11
(375/12042)
3.14
(373/11899)
3.29
(434/13193)
3.21
(383/11939)
0.0187 0.0018
Miyagi RC (n = 8270) %
(n)
5.14
(54/1050)
4.28
(71/1658)
4.19
(64/1527)
5.05
(76/1506)
3.75
(55/1466)
4.99
(53/1063)
0.4087 0.7773
Chi-square p < 0.001 0.0001 0.0250 0.0001 0.3499 0.0020   
Inland (n = 5015) %
(n)
4.99
(35/702)
4.68
(46/983)
4.96
(46/927)
5.81
(51/878)
4.50
(38/844)
4.70
(32/681)
0.8515 0.9079
Coast (n = 3255) %
(n)
5.46
(19/348)
3.70
(25/675)
3.00
(18/600)
3.98
(25/628)
2.73
(17/622)
5.50
(21/382)
0.1265 0.8022
Chi-square p < 0.0001 0.0004 0.0086 < 0.001 0.1136 0.0067   
  1. 2011H1 from May 2011 to October 2011, 2011H2 from November 2011 to April 2012, 2012H1 from May 2012 to October 2012, 2012H2 from November 2012 to April 2013, 2013H1 from May 2013 to October 2013, 2013H2 from November 2013 to April 2014
  2. Miyagi RC was combined with inland and coast
  3. 13 RCs (Regional Centers): the 13 regional centers other than Miyagi RC and Fukushima RC
  4. Chi-square p†: chi-square p values from the comparison of percentages across the time points in each site
  5. Chi-square p‡: chi-square p values from the comparison of percentages across the sites in each time point