Table 4 Comparison of the period of progression by age groups: from normal to elevated BP, stage 1 HTN, or stage 2 HTN
| Course | Age (mean±SD) | P-value | ||
|---|---|---|---|---|
|
40–49 years (n= 13,323) |
50–59 years (n= 3551) |
60–79 years (n= 1580) | ||
| Normal BP→ Elevated BP |
4.0±3.0 5031 (37.8) |
4.1±3.0 1237 (34.9) |
3.6±2.3 408 (25.8) | 0.01a |
| Normal BP→ Stage 1 HTN |
4.1±2.7 7442 (55.9) |
3.9±2.6 1980 (55.8) |
3.5±2.3 855 (54.1) | < 0.01b |
| Normal BP→ Stage 2 HTN |
3.6±2.3 850 (6.4) |
3.5±2.3 334 (9.4) |
2.8±1.6 317 (20.1) | < 0.01a |