Table 2. Annual prevalence in patient subgroups.
| Demographic or clinical characteristics | Patient subgroups‡ | Cases | |
|---|---|---|---|
| n | Prevalence | ||
| Age | 65-74 (n=28,900) | 701 | 24.3† |
| 75-84 (n=20,530) | 370 | 18.0† | |
| 85+ (n=13,697) | 149 | 10.9† | |
| Gender | Female (n=41,103) | 737 | 17.9* |
| Male (n=22,024) | 483 | 21.9* | |
| Race | Non-Hispanic whites (n=33,752) | 645 | 19.1† |
| Hispanics (n=16,529) | 286 | 17.3† | |
| Non-Hispanic blacks (n=2,320) | 71 | 30.6† | |
| Non-Hispanic others (n=10,526) | 218 | 20.7† | |
| Location | Rural-rural counties (n=21,070) | 417 | 19.8 |
| Rural-urban counties (n=3,759) | 65 | 17.3 | |
| Urban-urban counties (n=38,298) | 738 | 19.3 | |
| Married | Yes (n=17,328) | 316 | 18.2 |
| No (n=45,799) | 904 | 19.7 | |
| Anoxic Brain Injury§ | Yes (n=101) | 9 | 89.1† |
| No (n=63,026) | 1,211 | 19.2† | |
| Stroke§ | Yes (n=7,351) | 509 | 69.2† |
| No (n=55,776) | 711 | 12.7† | |
| Atherosclerosis§ | Yes (n=5,878) | 241 | 41.0† |
| No (n=57,249) | 979 | 17.1† | |
| Primary brain tumor§ | Yes (n=71) | 9 | 126.8† |
| No (n=63,056) | 1,211 | 19.2† | |
| Alzheimer's disease§ | Yes (n=4,866) | 198 | 40.7† |
| No (n=58,261) | 1,022 | 17.5† | |
| Parkinson's disease§ | Yes (n=1,247) | 70 | 56.1† |
| No (n=61,880) | 1,150 | 18.6† | |
| Dementia§ | Yes (n=4,943) | 270 | 54.6† |
| No (n=58,184) | 950 | 16.3† | |
| Hypertension§ | Yes (n=27,397) | 847 | 30.9† |
| No (n=35,730) | 373 | 10.4† | |
| Sleep apnea§ | Yes (n=2,811) | 99 | 35.2† |
| No (n=60,316) | 1,121 | 18.6† | |
| All patients (n=63,127) | 1,220 | 19.3 | |
*p<0.01, †p<0.001 in chi-square test for categorical subgroups and non-parametric trend test for ordinal subgroups, ‡Number of patients in each subgroup (n) refers to study-defined cases and controls, §Number of patients with various comorbid conditions slightly varies between incidence and prevalence cohorts (in Table 1 and 2) due to the different 1-year time frame used to identify comorbid conditions.
n: number of patients with epilepsy.