Table 10. Multivariable median regression analysis*.
| Independent variables | Model 1 (effective dose) |
Model 2 (CTDIvol) |
Model 3 (SSDE) |
|||||
|---|---|---|---|---|---|---|---|---|
| Coeff. (95% CI) | P value | Coeff. (95% CI) | P value | Coeff. (95% CI) | P value | |||
| Female | –0.68 (–0.92, –0.43) | <0.001 | –2.30 (–3.34, –1.26) | <0.001 | –1.91 (–3.56, –0.26) | 0.024 | ||
| Age | 0.02 (0.01, 0.02) | <0.001 | 0.05 (0.01, 0.08) | 0.003 | 0.06 (0.01, 0.10) | 0.016 | ||
| BMI | 0.26 (0.23, 0.29) | <0.001 | 1.00 (0.89, 1.11) | <0.001 | 1.38 (1.18, 1.58) | <0.001 | ||
| Mean Heart Rate | 0.03 (0.01, 0.04) | <0.001 | 0.13 (0.08, 0.18) | <0.001 | 0.08 (0.00, 0.15) | 0.047 | ||
| HPH (flash mode) | –2.86 (–3.78, –1.93) | <0.001 | –12.86 (–16.18, –9.54) | <0.001 | –18.57 (–22.57, –14.57) | <0.001 | ||
| Prospective triggering | –2.87 (–3.68, –2.07) | <0.001 | –8.35 (–11.38, –5.33) | <0.001 | –11.45 (–14.75, –8.16) | <0.001 | ||
| Ca score | 0.41 (0.18, 0.65) | <0.001 | –0.21 (–1.3, 0.97) | 0.726 | –6.41 (–8.57, –4.25) | <0.001 | ||
| Observations | 720 | – | 720 | – | 337 | – | ||
| Pseudo R-squared | 0.34 | – | 0.32 | – | 0.31 | – | ||
*using robust standard errors. CTDIvol, CT dose index volume; SSDE, size-specific dose estimate; BMI, body mass index; HPH, prospective triggered high pitch helical scanning mode.