Table 2.
Differences in Mean Systolic and Diastolic Diagnostic BP and Mean Daytime ABPM by Randomization Group*
|
Daytime ABPM |
Diagnostic protocol |
Adjusted† mean difference (diagnostic-ABPM) |
|||
|---|---|---|---|---|---|
| N | Mean (SD) | Mean (SD) | Mean difference (95% CI) | P-value‡ | |
| Systolic BP | |||||
| Clinic | 142 | 138.7 (11.8) | 133.9 (13.5) | −4.7 (−7.3, −2.2) | <0.001 |
| Home | 152 | 137.2 (10.7) | 137.1 (11.5) | −0.1 (−1.6, 1.5) | 0.92 |
| Kiosk | 140 | 137.4 (11.5) | 147.1 (14.0) | 9.5 (7.5, 11.6) | <0.001 |
| Diastolic BP | |||||
| Clinic | 142 | 86.0 (8.9) | 79.2 (8.3) | −7.2 (−8.8, −5.5) | <0.001 |
| Home | 152 | 86.0 (8.5) | 85.8 (8.2) | −0.4 (−1.4, 0.7) | 0.52 |
| Kiosk | 140 | 86.8 (9.9) | 91.2 (10.3) | 5.0 (3.8, 6.2) | <0.001 |
*Among individuals who had ≥1 diagnostic (clinic, home, kiosk) measurement, and ≥14 daytime ABPM measurements
+Linear regression models adjusted for age, sex, body mass index, education, and baseline systolic and diastolic BP (from screening visit), estimated with generalized estimating equations with robust (sandwich) variance estimation
‡P-value for mean difference between each method and ABPM. We also tested the difference between groups for the outcome of mean difference between diagnostic and ABPM measures. Differences in systolic BP were significant at P<.001 for clinic vs. home and home vs. kiosk, and P.002 for clinic vs. home. Adjusted mean difference in diastolic BP between groups was significant at P<.001 for clinic vs. home, clinic vs. kiosk, and home vs. kiosk.
Abbreviations: ABPM, ambulatory blood pressure monitoring; SD, standard deviation; CI, confidence interval; BP, blood pressure