Between visit reproducibility | ||||||

Measurement | n (% of whole cohort) | Value* | n | Visit 1 (mean±SD) | Visit 2 (mean±SD) | CV% |

cfPWV(S) (m/s)† | 1179 (73%) | 10.3±2.6 | 83 | 9.9±2.6 | 9.9±2.6 | 9.5 |

cfPWV(V) (m/s) | 1577 (92%) | 10.2±1.7 | 112 | 10.2±1.5 | 10.3±1.5 | 5.1 |

DC (x10^{−3} kPa^{−1}) | 1687 (98%) | 12.3±4.2 | 116 | 12.2±3.8 | 12.7±4.6 | 12.0 |

Distension (mm) | 1703 (99%) | 0.41±0.13 | 120 | 0.41±0.12 | 0.41±0.13 | 10.3 |

cIMT (mm) | 1696 (98%) | 0.81±0.16 | 120 | 0.79±0.14 | 0.75±0.13 | 7.8 |

Plaque | 1717 (99%) | 1444 (84%) | 123 | 76% | 88% | 0.8‡ |

ABPI | 1369 (80%) | 1.13±0.14 | 92 | 1.13±0.11 | 1.18±0.11 | 0.65§ |

Results for ultrasound analysis variables show interobserver and mean intraobserver (for cIMT and distension mean of two observers for plaque mean of five observers) reproducibility for each measure.

*Data presented as mean±SD and number and percent with plaque.

†Not assessed during home visits, percentage achieved calculated from the 1634 who attended clinic visits.

‡Gwet’s Agreement Coefficient measured reproducibility in plaque identification.

§ICC measured agreement in ABPI. Data are mean±SD or percentage presence.

ABPI, ankle brachial pressure index; cfPWV, carotid–femoral pulse wave velocity; cIMT, carotid intima-media thickness; CV, coefficient of variation; DC, distensibility coefficient; ICC, intraclass correlation; n, number of subjects; S, Sphygmocor; V, Vicorder.