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Table 2 Modeled relationship between count rate and water column height

From: The effect of object size on the sensitivity of single photon emission computed tomography: comparison of two CZT cardiac cameras and an Anger scintillation camera

Fixed effects

Coefficient value

Standard error

Degrees of freedom

P -value a

Intercept

44.917

0.776

57

<.0001

D530c vs. D-SPECT

−26.300

1.049

12

<.0001

A-SPECT vs. D-SPECT

−37.779

1.021

12

<.0001

Slope for the D-SPECT

−1.747

0.072

57

<.0001

Slope for the D530c

0.277

0.043

57

<.0001

Slope for the A-SPECT

−0.022

0.007

57

0.0016

Random effects

Standard deviation

Standard deviation adjustment per camera

Intercept

1.42

D-SPECT

D530c

A-SPECT

Residual

0.497

1

0.706

0.108

  1. A mixed-effect regression model was used to estimate the relationship between count rate and water column height for each camera. The model fitted different fixed-effects intercepts and slopes for the three cameras and used random intercept effects for the series, with heteroscedasticity by camera.
  2. aFrom t-test for testing that the coefficient equals zero.