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Table 2 Independent predictors of the difference between non-invasive cuff and invasive arterial blood pressure by multivariable linear regression

From: The accuracy of blood pressure measured by arterial line and non-invasive cuff in critically ill children

Outcome Variable Effect size (95 % CI) P value
For the n = 66 flush-tested arterial lines
∆SBP Day category 4.9 (0.2, 9.7) 0.043
∆DBP Vasodilator in use 15.6 (2.9, 28.3) 0.016
  Day category 5.5 (1.6, 9.5) 0.007
  Optimally damped −7.2 (−12.2, −2.2) 0.005
∆MAP Vasodilator in use 10.0 (−0.3, 20.4) 0.057
  Day category 4.5 (1.3, 7.7) 0.007
  Optimally damped −4.0 (−8.0, 0.1) 0.058
For all 147 arterial lines
∆SBP Inotrope in use −5.75 (−11.3, −0.18) 0.043
  Peripheral AL site 5.03 (0.06, 10.0) 0.048
∆DBP - - All ns
∆MAP - - All ns
For the 42 flush-tested arterial lines in the d1–3 category
∆SBP - - All ns
∆DBP - - All ns
∆MAP Vasodilator in use 17.8 (1.6, 34.1) 0.032
  Optimally damped −5.4 (−10.3, −0.4) 0.035
For all 83 arterial lines tested in the d1–3 category
∆SBP Inotrope in use −8.1 (−16.1, −0.13) 0.047
  Peripheral AL site 6.3 (−0.4, 13.0) 0.065
  Weight −0.13 (−0.27, 0.01) 0.060
∆DBP - - All ns
∆MAP - - All ns
  1. SBP systolic blood pressure, DBP diastolic blood pressure, MAP mean arterial pressure, AL arterial line(s), ∆ difference (non-invasive cuff blood pressure minus invasive arterial blood pressure), d1–3 day 1–3, ns not significant. There was no meaningful difference in results if inotrope score was entered instead of inotrope in use; for all arterial lines and ∆SBP the effect size for inotrope score was 0.98 (0.28, 1.68; p = 0.007) for 147 AL, and 1.36 (0.11, 2.61; p = 0.033) for all 83 d1–3-category AL