Table 1.
Characteristics of Patients with and without a Dilated Eye Examination from the HealthCore Integrated Research Database
| Characteristic | All patients, (N = 339,646) | Patients with a dilated eye examination (N = 144,525) | Patients without a dilated eye examination (N = 195,114) | |||||
|---|---|---|---|---|---|---|---|---|
| Age, yrs, mean (SD) | 56.47 (11.00) | 59.18 (10.52) | 54.46 (10.92) | |||||
| Total patients, N | With characteristic, % | With an examination, % | Total patients, N | With characteristic, % | Without an examination, % | P value | ||
| Sex | ||||||||
| Male, N (%) | 187,586 (55.23) | 75,695 | 40.35 | 52.38 | 111,891 | 59.65 | 57.35 | <.0001 |
| Female, N (%) | 152,053 (44.77) | 68,830 | 45.27 | 47.62 | 83,223 | 54.73 | 42.65 | |
| Geographic region | ||||||||
| Northeast: CT, ME, NH, and NY, N (%) | 59,224 (17.44) | 37,258 | 62.91 | 25.78 | 21,966 | 37.09 | 11.26 | <.0001 |
| Midwest: IN, MO, OH, and WI, N (%) | 126,720 (37.31) | 46,992 | 37.08 | 32.51 | 79,728 | 62.92 | 40.86 | |
| South: GA, VA, DE, and KY, N (%) | 92,869 (27.34) | 37,213 | 40.07 | 25.75 | 55,656 | 59.93 | 28.52 | |
| West: NV and CA, N (%) | 55,751 (16.41) | 21,318 | 38.24 | 14.75 | 34,433 | 61.76 | 17.65 | |
| Health plan type | ||||||||
| HMO, N (%) | 80,570 (23.72) | 37,029 | 45.96 | 25.62 | 43,541 | 54.04 | 22.32 | <.0001 |
| PPO, N (%) | 231,742 (68.23) | 97,733 | 42.17 | 67.62 | 134,009 | 57.83 | 68.68 | |
| Other, N (%) | 27,327 (8.05) | 9763 | 35.73 | 6.76 | 17,564 | 64.27 | 9.00 | |
| Vision benefit, N (%) | 115,142 (33.90) | 50,208 | 43.61 | 34.74 | 64,934 | 56.39 | 33.28 | <.0001 |
NOTES: There were 2 subgroup comparisons: patients with and without an eye examination; t-test was used for continuous variables, and chi-square test was used for categorical variables.
HMO indicates health maintenance organization; PPO, preferred provider organization; SD, standard deviation.