Table 2.

Calibration-free BP estimation: Fitting errors (mmHg) at different SBP levels.

	Group I	Group II	Group III
Young
Measurements (n)	418	257	64
SBP Error	6.3 ± 7.2**	−3.9 ± 7.2	−20.2 ± 14.2**
DBP Error	3.6 ± 6.7**	−2.4 ± 7.3	−10 ± 11.7**
Older
Measurements (n)	364	574	402
SBP Error	12.8 ± 9.0**	0.5 ± 8.2	−14.6 ± 11.5**
DBP Error	4.2 ± 7.0**	0.5 ± 7.8	−2.9 ± 8.9**

Group I: SBP < 120 mmHg; Group II: 120 mmHg ≤ SBP < 140 mmHg; Group III: SBP ≥ 140 mmHg.

**P < 0.001 versus group II.