Table 2. Patients in the Medicare and VHA Systems Who Underwent Cataract Surgery From 2002 to 2012.
| Timing of Cataract Surgery | No. (%) of Medicare Patients | No. (%) of VHA Patients | OR (95% CI) for Percentage of Medicare vs VHA Patients | P Valuea for χ2 Test |
|---|---|---|---|---|
| Overall study population (1 156 211 Medicare patients and 1 917 254 VHA patients) | ||||
| Within 1 y of cataract diagnosis | 213 589 (18.5) | 120 196 (6.3) | 3.39 (3.36-3.41) | <.001 |
| Within 5 y of cataract diagnosis | 414 586 (35.9) | 240 884 (12.6) | 3.89 (3.87-3.91) | <.001 |
| Male patients (473 175 Medicare patients and 1 852 158 VHA patients) | ||||
| Within 1 y of cataract diagnosis | 85 624 (18.1) | 117 115 (6.3) | 3.27 (3.24-3.31) | <.001 |
| Within 5 y of cataract diagnosis | 160 938 (34.0) | 234 386 (12.7) | 3.56 (3.53-3.58) | <.001 |
| Patients ≥65 y (1 156 211 Medicare patients and 1 011 799 VHA patients) | ||||
| Within 1 y of cataract diagnosis | 213 589 (18.5) | 72 085 (7.1) | 2.95 (2.93-2.98) | <.001 |
| Within 5 y of cataract diagnosis | 414 586 (35.9) | 159 252 (15.8) | 2.99 (2.97-3.01) | <.001 |
Abbreviations: OR, odds ratio; VHA, Veterans Health Administration.
a
P values refer to comparisons for χ2 tests between the Medicare and VHA populations across columns for the same row.