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Table 2 Demographic and clinical features: comparison between patients aged > or < 65 years

From: Bipolar disorder in late life: clinical characteristics in a sample of older adults admitted for manic episode

  Pts aged ≥ 65
(N = 20)
Pts aged < 65
(N = 20)
  
  Mean Sd Mean Sd T/z p
Age at onset 48.9 23.6 25.6 12.0 3.9 0.0004
  N % N % χ2 p
Irritability 12 60 12 60 0 1
Delusions 12 60.0 14 70.0 0.44 0.51
Hallucinations 6 30.0 1 5.0 4.33 0.09*
Family history for mood disorders (two missing
values in both groups)
6 33.3 12 66.7 4.0 0.05
  1. * two-tailed Fisher's exact test