Table 2

Intra-Device Repeatability of BP Measurement by CLB and CB

ICC (95% CI)Mean Difference ± 2 SDs
Total (N = 932)
 SBP0.918 (0.907–0.927)−0.41 ± 16.1
 DBP0.842 (0.812–0.866)−1.53 ± 12.8
Static (n = 386)
 SBP0.950 (0.940–0.959)0.26 ± 13.1
 DBP0.903 (0.880–0.921)−1.01 ± 10.8
BP rise (n = 182)
 SBP0.920 (0.889–0.942)−2.07 ± 14.9
 DBP0.805 (0.514–0.902)−4.04 ± 11.2
BP lowering (n = 102)
 SBP0.856 (0.794–0.900)1.00 ± 20.3
 DBP0.784 (0.697–0.875)−0.60 ± 15.3
Reproducibility (n = 262)
 SBP0.844 (0.805–0.849)−0.77 ± 18.3
 DBP0.752 (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.