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| Threshold for Administering a Vasoconstrictor (mmHg) | 1989 (%) | 1994 (%) | 1999 (%) | 2004 (%) |
|---|---|---|---|---|
| >50 | 6.2 | 6.7 | 5.8 | 8.9 |
| 40 to 49 | 9.3 | 7.6 | 4.3 | 8.9 |
| 30 to 39 | 24.8 | 20.1 | 34.8 | 24.4 |
| 20 to 29 | 34.1 | 41.9 | 43.5 | 40.0 |
| Do not treat | 25.6 | 23.8 | 8.7 | 17.8 |
