Table 2.
Relation of fourth Korotoff phase and fifth Korotoff phase difference to mean blood pressure levels and to interobservera differences among children
| Sex | K4 – K5, mm Hg | No. | K4 | K5 | At least 1 K5 value of 0mm Hg, % | ||
|---|---|---|---|---|---|---|---|
| Mean | Interobserver difference, mm Hg | Mean | Interobserver difference, mm Hg | ||||
| Overall | — | 26,356 | 62±9 | 6.9±6 | 49±13 | 10.4±9 | 7.4 |
| Boys | 0–9 | 4,346 | 64±9 | 6.4±5 | 56±9 | 7.7±6 | 0.1 |
| 10–19 | 6,842 | 61±9 | 7.0±6 | 47±9 | 10.1±8 | 2.7 | |
| 20–29 | 1,652 | 58±9 | 7.9±7 | 35±10 | 17.2±13 | 30.8 | |
| 30–39 | 424 | 57±9 | 7.9±8 | 23±9 | 26.8±16 | 77.6 | |
| ≥40 | 138 | 61±9 | 8.5±7 | 15±9 | 24.1±17 | 96.4 | |
| Girls | 0–9 | 5,549 | 65±9 | 6.3±5 | 58±10 | 7.5±6 | 0.1 |
| 10–19 | 5,949 | 62±9 | 7.1±6 | 48±10 | 10.0±8 | 2.6 | |
| 20–29 | 1,085 | 58±9 | 7.2±6 | 34±10 | 16.1±12 | 30.9 | |
| 30–39 | 274 | 57±9 | 7.8±7 | 23±9 | 24.2±16 | 78.1 | |
| ≥40 | 97 | 59±9 | 8.3±8 | 14±9 | 23.3±18 | 97.9 | |
aEach of the 2 observers recorded 3 measurements for both the fourth Korotoff phase (K4) and the fifth Korotoff phase (K5). Mean values of K4 and K5 are based on the mean of the 6 measurements.