Table 2.
Intra-Device Repeatability of BP Measurement by CLB and CB
| ICC (95% CI) | Mean Difference ± 2 SDs | |
|---|---|---|
| Total (N = 932) | ||
| SBP | 0.918 (0.907–0.927) | −0.41 ± 16.1 |
| DBP | 0.842 (0.812–0.866) | −1.53 ± 12.8 |
| Static (n = 386) | ||
| SBP | 0.950 (0.940–0.959) | 0.26 ± 13.1 |
| DBP | 0.903 (0.880–0.921) | −1.01 ± 10.8 |
| BP rise (n = 182) | ||
| SBP | 0.920 (0.889–0.942) | −2.07 ± 14.9 |
| DBP | 0.805 (0.514–0.902) | −4.04 ± 11.2 |
| BP lowering (n = 102) | ||
| SBP | 0.856 (0.794–0.900) | 1.00 ± 20.3 |
| DBP | 0.784 (0.697–0.875) | −0.60 ± 15.3 |
| Reproducibility (n = 262) | ||
| SBP | 0.844 (0.805–0.849) | −0.77 ± 18.3 |
| DBP | 0.752 (0.694–0.800) | −0.90 ± 14.5 |
The reproducibility of the measurements, the ICC and its 95% confidence interval (CI) value between the BP value of test device (CLB) and the reference device (CB; cuff-wearing sphygmomanometer), were calculated. In general, an ICC >0.8 represents good repeatability, and an ICC >0.9 represents excellent repeatability of measurements.
ICC = intraclass correlation coefficient; other abbreviations as in Table 1.