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Table 2 OLP regression results for CIMT measurements

From: Carotid intima-medial thickness measured on multiple ultrasound frames: evaluation of a DICOM-based software system

Comparison

a'

95% CI

b'

95% CI

Fixed Bias

Proportional Bias

Six-frame measurement protocol

Inter-Sonographer

0.048

-0.03, 0.12

0.964

0.87, 1.07

No

No

Intra-Sonographer 1

0.013

-0.08, 0.10

1.002

0.89, 1.13

No

No

Intra-Sonographer 2

-0.025

-0.12, 0.06

1.025

0.92, 1.15

No

No

Inter-Observer

-0.024

-0.06, 0.01

1.053

1.01, 1.10

No

Yes

Intra-Observer 1

0.004

-0.02, 0.03

0.992

0.96, 1.03

No

No

Intra-Observer 2

-0.031

-0.07, 0.003

1.056

1.01, 1.11

No

Yes

Sixty-frame measurement protocol

Inter-Sonographer

0.001

-0.10, 0.09

1.027

0.91, 1.16

No

No

Intra-Sonographer 1

-0.008

-0.11, 0.08

1.017

0.90, 1.15

No

No

Intra-Sonographer 2

-0.009

-0.10, 0.07

0.995

0.89,1.11

No

No

Inter-Observer

-0.106

-0.17, -0.05

1.159

1.08,1.24

Yes

Yes

Intra-Observer 1

-0.020

-0.04, -0.003

1.031

1.01,1.05

Yes

Yes

  1. OLP indicates ordinary least products; CIMT, carotid intima-medial thickness; CI, confidence interval.
  2. The ordinary least products regression equation is y = a' + b'x. 95% CIs are for the population parameters α ' and β '. Fixed bias is present if the 95% CI for α ' does not contain zero. Proportional bias is present if 95% CI for β ' does not contain one.