TABLE 3.
Comparison of central systolic blood pressure (cSBP) measured by cuff or tonometry, stratified by sex, ethnicity, age and presence of cardiovascular disease
| Stratifying factor | Difference in cSBP (Cuff-tonometry), mmHg | Limits of agreement (mmHg) | P |
| Male | 3 ± 6 | (−8, 15) | 0.1 |
| Female | 3 ± 5 | (−8, 13) | |
| European | 3 ± 6 | (−9, 16) | 0.8 |
| South Asian | 3 ± 5 | (−7, 13) | |
| African Caribbean | 3 ± 5 | (−7, 13) | |
| Age | |||
| ≤69 years | 3 ± 6 | (−9, 15) | 0.6 |
| >69 years | 3 ± 5 | (−7, 14) | |
| No diabetes | 3 ± 6 | (−8, 14) | 0.002 |
| Diabetes | 4 ± 5 | (−5, 13) | |
| No Hypertension | 3 ± 5 | (−7, 13) | 0.3 |
| Hypertension | 3 ± 6 | (−9, 15) | |
| No CHD | 3 ± 6 | (−8, 15) | 0.1 |
| CHD | 4 ± 5 | (−6, 14) | |
| Normal weight | 3 ± 5 | (−8, 13) | 0.003 |
| Overweight | 3 ± 6 | (−9, 15) | |
| Obese | 4 ± 5 | (−6, 15) | |
| Antihypertensive medication | |||
| No beta blocker | 3 ± 6 | (−9, 16) | 0.5 |
| Beta blocker | 3 ± 5 | (−7, 13) | |
| No CCB | 3 ± 7 | (−10, 16) | 0.5 |
| CCB | 4 ± 5 | (−7, 14) | |
| No ARB/ACEI | 3 ± 5 | (−7, 13) | 0.1 |
| ARB/ACEI | 4 ± 7 | (−9, 17) | |
Data are mean differences ± SD of difference and (limits of agreement) for cuff cSBP- tonometry cSBP (calibrated using brachial systolic and diastolic pressure). Comparisons of stratified groups were made using a Student's t-test or analysis of variance (ANOVA). A P value of <0.05 was considered statistically significant. ACEI, angiotensin-converting enzyme inhibitor; ARB, angiotensin receptor blocker; CCB, calcium channel blocker; CHD, coronary heart disease.