Table 1—

Characteristics of patients with type 2 diabetes from the MarketScan database

Sample characteristic1997199819992000P*
Full year continuously enrolled (n)2,261,4672,423,0243,069,4553,279,155
Type 2 diabetes (n)81,324124,203161,352177,718
Female (%)48.748.448.948.90.04
Mean age (SD) (years)59.1 (13.7)63.0 (13.9)60.9 (13.9)61.2 (13.8)<0.0001
Aged <50 years (%)20.415.718.918.30.20
Aged 50–64 years (%)50.435.241.040.8<0.0001
Aged >65 years (%)29.349.140.140.9<0.0001
Insurance type (%)
 Indemnity55.542.243.840.2<0.0001
 PPO/POS18.729.738.442.8<0.0001
 Capitation/HMO10.211.516.016.3<0.0001
 Unknown15.616.61.90.7<0.0001
≥1 diabetes complication (%)**23.928.128.429.1<0.0001
 Retinopathy8.510.211.411.4<0.0001
 Neuropathy7.08.48.08.2<0.0001
 Peripheral vascular disease§8.711.410.110.4<0.0001
 Nephropathy5.96.46.97.5<0.0001
  • *

    * Cochran-Armitage test;

  • **

    ** diabetes complications include: diabetic retinopathy, neuropathy, nephropathy, and peripheral vascular disease;

  • retinopathy defined by ICD-9-CM codes: 250.50–250.53, 361.00–361.07, 362.01–362.02, 362.14, 362.16, 362.81–362.83, 364.42, 365.44, 366.41, or (362.01–362.02 and 369.00–369.73);

  • neuropathy defined by ICD-9-CM codes: 250.60–250.63, 337.10, 354.00–355.99, 357.20, 358.10, 536.30, or 713.50;

  • §

    § peripheral vascular disease defined by ICD-9-CM codes: 40.00, 250.70–250.73, 443.81, 681.00–682.90, 707.10–707.90, or 785.40;

  • nephropathy defined by ICD-9-CM codes: 250.40–250.43, 581.10, 581.81, 582.10, 583.81–583.90, 584.50–584.60, 584.70, 584.80, 586.00, 587.00, or 790.60.