| Overall | No BP measurements on record | BP recorded every 4 yr or less often | BP recorded every 2-4 yr | BP recorded every 1-2 yr | BP recorded more than once/yr | |
|---|---|---|---|---|---|---|
| No. of patients (%) | 9667 | 3671 (38.0) | 681 (7.0) | 1529 (15.8) | 2387 (24.7) | 1399 (14.5) |
| No. of BP measures, mean ± SD | 1.37 ± 1.57 | 0 ± 0 | 1.01 ± 0.10 | 1.47 ± 0.62 | 2.54 ± 1.36 | 3.02 ± 1.89 |
| Duration of observation, yr, mean ± SD < denominator of rate > | 3.25 ± 1.78 | 2.82 ± 1.66 | 5.33 ± 1.05 | 3.95 ± 1.48 | 3.48 ± 1.75 | 2.23 ± 1.52 |
| No. of recorded encounters per patient, mean ± SD | 7.88 ± 5.57 | 7.03 ± 5.11 | 10.43 ± 6.31 | 8.53 ± 5.58 | 8.35 ± 5.64 | 7.39 ± 5.64 |
| Age at first encounter, yr, mean ± SD | 9.26 ± 4.66 | 8.39 ± 4.85 | 8.01 ± 3.33 | 9.37 ± 4.15 | 9.64 ± 4.45 | 11.34 ± 4.78 |
| Age first BP recorded, yr, mean ± SD | 10.97 ± 4.44 | NA | 11.29 ± 3.73 | 11.08 ± 4.22 | 10.44 ± 4.48 | 11.60 ± 4.81 |
| Female sex, N (%) | 5098 (52.7) | 1802 (49.1) | 339 (49.8) | 780 (51.0) | 1315 (55.1) | 862 (61.6) |
| BMI centile, mean ± SD* | 58.19 ± 29.16 (n = 7380) | 57.04 ± 29.17 (n = 1773) | 58.84 ± 29.81 (n = 606) | 60.21 ± 28.90 (n = 1424) | 57.66 ± 29.08 (n = 2271) | 58.16 ± 29.15 (n = 1306) |
| Obese, N (%) | 875 (11.9) | 181 (10.2) | 83 (13.7) | 198 (13.9) | 255 (11.2) | 158 (12.1) |
| Recorded family history of hypertension, N (%) | 312 (3.2) | 67 (1.8) | 12 (1.8) | 41 (2.7) | 123 (5.2) | 69 (4.9) |
Note: BMI = body mass index, BP = blood pressure, NA = not applicable, SD = standard deviation.*Number of patients with available data shown in parentheses.