Table 1.
Baseline sociodemographic and clinical characteristics of subjects with an incident elevated BPa at derivation and validation study sites.
| Characteristic | Model derivation site,b n=5598 | Model validation site A,b n=1377 | Model validation site B,b n=5135 |
|---|---|---|---|
| Age in years, mean (SD) | 10.3 (3.92) | 10.3 (4.32) | 9.5 (4.63) |
| Sex, n (%) | |||
| Male | 3053 (54.5) | 719 (52.2) | 2572 (50.1) |
| Female | 2545 (45.5) | 658 (47.8) | 2563 (49.9) |
| Race/ethnicity, n (%) | |||
| Asian/Pacific Islander | 186 (3.3) | 85 (6.2) | 973 (18.9) |
| Black | 247 ( 4.4) | 257 (18.7) | 385 (7.5) |
| Hispanic | 1164 (20.8) | 56 (4.1) | 1599 (31.1) |
| Other racial/ethnic group | 198 (3.5) | 107 (7.8) | 75 (1.5) |
| White | 3233 (57.8) | 855 (62.1) | 1821 (35.5) |
| Missing | 570 (10.2) | 17 (1.2) | 282 (5.5) |
| Household income of census tract in dollars, median (IQR) | 61741 (47323, 76192) | 55341 (41106, 68036) | 61389 (46250, 76760) |
| Body mass index percentile, n (%) | |||
| < 85th | 3244 (57.9) | 742 (53.9) | 2559 (49.8) |
| 85th to < 95th | 956 (17.1) | 246 (17.9) | 972 (18.9) |
| ≥ 95th | 1378 (24.6) | 375 (27.2) | 1564 (30.5) |
| Missing | 20 (0.4) | 14 (1.0) | 40 (0.8) |
| Category of incident BP elevation,c n (%) | |||
| Stage 1 systolic elevation | 3024 (54.0) | 980 (71.2) | 3623 (70.6) |
| Stage 2 systolic elevation | 262 (4.7) | 69 (5.0) | 348 (6.8) |
| Diastolic elevated, systolic not elevated | 2312 (41.3) | 328 (23.8) | 1164 (22.7) |
| BP immediately preceding incident elevated BP, n (%) | |||
| Normotensive | 3916 (70.0) | 727 (52.8) | 2078 (40.5) |
| Pre-hypertensive | 593 (10.6) | 179 (13.0) | 734 (14.3) |
| Missing | 1089 (19.5) | 471 (34.2) | 2323 (45.2) |
| Clinical setting of incident elevated blood pressure, n (%) | |||
| Primary care, well-child care | 1235 (22.1) | 624 (45.3) | 2500 (48.7)d |
| Primary care, non-well-child care | 2896 (51.7) | 697 (50.6) | 2115 (41.2)d |
| Medical and surgical specialty | 1467 (26.2) | 56 (4.1) | 341 (6.6)d |
SD indicates standard deviation; IQR, inter-quartile range; BP, blood pressure
Incident elevated BP defined as systolic and/or diastolic BP ≥ 95th percentile for age, height, and sex.
In pair-wise comparisons between study sites (site A vs. derivation site; site B vs. derivation site), all characteristics listed in this table were significantly different between sites (p < 0.01), except for the comparisons of age and sex between site A and the derivation site, which were not significantly different.
Represents 3 mutually exclusive categories: stage 1 systolic elevation (systolic 95th percentile to the 99th percentile plus 5 mm Hg); stage 2 systolic elevation (systolic > 99th percentile plus 5 mm Hg); or diastolic-only elevation (a diastolic ≥ 95th percentile with a systolic < 95th percentile)
Clinical setting of incident elevated BP was missing for n=179 (3.5%) of subjects from model validation site B.