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Table 4 The comparison of "middle age"class and other classes except for "middle age"

From: Psychiatric assessment of suicide attempters in Japan: a pilot study at a critical emergency unit in an urban area

   Middle age (n = 43) except middle age(n = 277) Analysis
   N (%) N (%) χ2 df P
Methods       
  Drug over dose 11 (26) 145 (52) 10.7 1 < 0.01
  Laceration 13 (30) 39 (14) 7.1 1 0.01
  High lethality 34 (79) 191 (69) 1.8 1 0.21
Education     5.9 2 0.052
  Compulsory education 7 (16) 71 (26)    
  High school education and over 27 (63) 180 (65)    
Axis I       
Mood disorders   16 (37) 62 (22) 4.4 1 0.054
Adjustment disorders   3 (7) 54 (19) 4.0 1 0.053
Previous deliberate self harm   6 (14) 115 (42) 12.1 2 < 0.01
Current psychiatric treatment   23 (53) 185 (67) 8.8 3 < 0.05