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Table 2: P values from the assessment of TTP, peak opacification, and AUC differences when comparing injection protocols: variable rate and volume with constant duration (2 seconds)*
Rate TTP Capillary TTP Arterial TTP Venous Peak Capillary Peak Arterial Peak Venous AUC Capillary AUC Arterial AUC Venous
Overall .0334 .0102 .0363 .0009 .0057 .0003 .0004 .0003 <.0001
2–4 mL/s .9598 .4923 .4592 .1147 .0179 .0020 .1111 .0152 .0002
2–6 mL/s .1024 .0110 .0302 .0022 .0038 .0002 .0007 .0003 <.0001
2–8 mL/s .0126 .0041 .0114 .0002 .0011 <.0001 <.0001 <.0001 <.0001
4–6 mL/s .1117 .0404 .1165 .0503 .4158 .2065 .0171 .0512 .0584
4–8 mL/s .0139 .0153 .0465 .0034 .1592 .0534 .0018 .0062 .0020
6–8 mL/s .2680 .6066 .6069 .1678 .5229 .4355 .2423 .2739 .0918
Note:—TTP indicates time-to-peak; AUC, area under curve.
* P values for paired contrasts were not calculated if no overall significant difference of the group was observed.