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Table 3 Mean PDD/DDD ratio by number of drugs and medication class

From: Drug treatment patterns in bipolar disorder: analysis of long-term self-reported data

Number of drugs in class Number of regimens a(%) Mean (SD) PDD/DDD ratio
Antidepressantsb   
   1 204 (64) 1.3 (1.1)
   2 97 (30) 2.5 (1.6)
   3 15 (5) 3.5 (2.0)
   4 3 (1) 5.1 (1.5)
Benzodiazepinesc   
   1 107 (80) 0.6 (0.8)
   2 24 (18) 1.4 (1.3)
   3 2 (2) 4.0 (1.5)
Antipsychoticsd   
   1 167 (77) 0.7 (0.7)
   2 47 (22) 2.2 (2.0)
   3 3 (1) 7.4 (6.5)
  1. aSome patients took multiple regimens with different number of drugs within a medication class; b236 patients took antidepressants for 50% or more days; c111 patients took benzodiazepines for 50% or more days; d176 patients took antipsychotics for 50% or more days.