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Table 1 Pre-index demographic characteristics by insurance type and cohort

From: A retrospective study on the impact of comorbid depression or anxiety on healthcare resource use and costs among diabetic neuropathy patients

  Medicare supplemental insurance Commercial insurance
  DN-only DN-DA   DN-only DN-DA  
# Observations 16,831 1,699 p-value* 17,205 3,105 p-value*
Age (mean, SD) 75.6 (6.1) 75.4 (6.3) 0.44 55.0 (7.4) 53.7 (7.7) < 0.05
Male (%) 52.9 44.2 < 0.05 53.7 41.1 < 0.05
Plan types (%)**    < 0.05    0.54
   Comprehensive 65.2 60.4   16.1 17.3  
   PPO 21.6 21.9   47.3 45.8  
   HMO 11.8 16.5   20.3 22.8  
   Other 0.3 0.1   15.6 13.3  
   Missing 1.1 1.0   0.8 0.9  
Region (%)    < 0.05    0.19
   Northeast 10.8 8.5   8.1 8.0  
   North central 41.3 42.1   29.9 31.4  
   South 30.2 28.4   43.2 38.6  
   West 16.7 20.1   18.0 21.1  
   Missing 1.0 0.9   0.7 0.9  
  1. Source: Thomson Medstat MarketScan database for patients with Medicare supplemental and commercial insurance (2004–2005)
  2. * Student t-tests for continuous variables and Cochran-Mantel-Haenszel tests for categorical variables were performed.
  3. ** HMO = Health Maintenance Organization; PPO = Preferred Provider Organization