Table 2.
Individuals in the First Nations Community Health Source hypertension registry, by enrollment status (N=1497).
| Characteristics | Enrolled in the RCTa (study cohort; n=295) | Not enrolled in the RCT (n=1202) | Total (recruitment pool; n=1497) | P value | ||
| Demographics | ||||||
| Age (years), n (%) | .71 | |||||
| 18-44 | 71 (24.1) | 278 (23.1) | 349 (23.3) | — | ||
| 45-64 | 169 (57.3) | 674 (56.1) | 843 (56.3) | — | ||
| ≥65 | 55 (18.6) | 250 (20.8) | 305 (20.4) | — | ||
| Age (years), mean (SD) | 53.4 (11.3) | 53.6 (12.5) | 53.6 (12.2) | .52 | ||
| Female, n (%) | 176 (59.7) | 637 (53.0) | 813 (54.3) | .04 | ||
| Race, n (%) | <.001 | |||||
| AI/ANb | 65 (22.0) | 358 (29.8) | 423 (28.3) | — | ||
| Hispanic | 155 (52.5) | 442 (36.8) | 597 (39.9) | — | ||
| Non-Hispanic white | 47 (15.9) | 248 (20.6) | 295 (19.7) | — | ||
| Non-Hispanic African American | 18 (6.1) | 83 (6.9) | 101 (6.8) | — | ||
| Other | 7 (2.4) | 53 (4.4) | 60 (4.0) | — | ||
| Missing | 3 (1.0) | 18 (1.5) | 21 (1.4) | — | ||
| BMIc, mean (SD); number of people with missing values | 32.6 (7.3); 1 | 32.2 (7.9); 23 | 32.2 (7.8); 24 | .21 | ||
| Time between last clinic visit and randomization date in days, mean (SD) | 164.3 (174.8) | 230.9 (217.9) | 217.8 (211.8) | <.001 | ||
| Insurance, n (%) | <.001 | |||||
| Commercial | 111 (37.6) | 544 (45.3) | 655 (43.8) | — | ||
| IHSd | 9 (3.1) | 82 (6.8) | 91 (6.1) | — | ||
| Medicaid | 46 (15.6) | 207 (17.2) | 253 (16.9) | — | ||
| Medicare | 46 (15.6) | 227 (18.9) | 273 (18.2) | — | ||
| Self-pay | 77 (26.1) | 120 (10.0) | 197 (13.2) | — | ||
| Unknown | 6 (2.0) | 22 (1.8) | 28 (1.9) | — | ||
| Ever homeless, n (%) | 47 (15.9) | 165 (13.7) | 212 (14.2) | .35 | ||
| Hypertension characteristics | — | |||||
| Hypertension diagnosis in EHRe, n (%) | 271 (91.9) | 1074 (89.4) | 1345 (89.8) | .24 | ||
| Hypertension medication order in EHR, n (%) | 260 (88.1) | 1042 (86.7) | 1302 (87.0) | .56 | ||
| Most recent SBPf,g, mmHg, mean (SD) | 129.3 (13.9) | 131.9 (17.3) | 131.4 (16.7) | .04 | ||
| Most recent DBPg,h, mmHg, mean (SD) | 77.0 (9.8) | 78.7 (10.6) | 78.4 (10.5) | .01 | ||
| SBP≥140 or DBP≥90, n (%) | 72 (24.4) | 373 (31.0) | 445 (29.7) | .03 | ||
| Comorbidities, n (%) | — | |||||
| Diabetes | 97 (32.9) | 385 (32.0) | 482 (32.2) | .78 | ||
| Cardiovascular disease | 14 (4.7) | 39 (3.2) | 53 (3.5) | .22 | ||
| Depression | 77 (26.1) | 256 (21.3) | 333 (22.2) | .09 | ||
| Chronic kidney disease | 31 (12.7) | 117 (13.1) | 148 (13.0) | .91 | ||
| Geographic variablesi | — | |||||
| Census track median household income, mean (SD) | US $35,900 (14,199.9) | US $35,735 (16,186.5) | US $35,768 (15,808.6) | .27 | ||
| Percent of census track with less than high school education, mean (SD) | 17.6 (0.11) | 17.4 (0.11) | 17.4 (0.11) | .59 | ||
| Distance from home address to clinic (miles), median (IQRj) | 3.89 (1.62-6.76) | 3.91 (1.64-7.56) | 3.91 (1.63-7.47) | .65 | ||
| Live in the City of Albuquerque, n (%) | 269 (91.2) | 1,070 (89.0) | 1,339 (89.4) | .29 | ||
| Live in Bernalillo County, n (%) | 283 (95.9) | 1,122 (93.3) | 1,405 (93.9) | .11 | ||
aRCT: randomized controlled trial.
bAI/AN: American Indian or Alaska Native.
cBMI: body mass index.
dIHS: Indian Health Service.
eEHR: electronic health record.
fSBP: systolic blood pressure.
gPrimary care visits only.
hDBP: diastolic blood pressure.
i12 individuals had addresses that could not be geocoded, 1 in the RCT group and 11 in the not enrolled group.
jIQR: interquartile range.