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Table 5 Effect sizes and corresponding p values estimated from the linear mixed-effects model for velocity measurements

From: In vitro evaluation of cerebrospinal fluid velocity measurement in type I Chiari malformation: repeatability, reproducibility, and agreement using 2D phase contrast and 4D flow MRI

Effect Effect size (95% CI) [cm/s] p value
Intercept (Center 1: 2D PC MRI at FM) 14.16 (13.12, 15.21) 4.4 × 10–74*
Scan type (4D – 2D) −0.02 (−0.28, 0.24) 0.86
Center 2 −0.45 (−1.27, 0.36) 0.27
Center 3 −1.17 (−2.63, 0.29) 0.12
Center 4 −2.09 (−3.42, 0.76) 2.2 × 10–3*
Center 5 −2.52 (−3.23, −1.76) 3.2 × 10–10*
C1 −0.80 (−1.37, −0.23) 0.006
C2M −0.49 (−0.96, −0.02) 0.042
C2B 0.01 (−0.46, 0.48) 0.95
C3 −1.21 (−1.67, −0.75) 6.22 × 10–7*
C4 −1.36 (−1.85, −0.87) 1.08 × 10–7*
C5 −0.54 (−1.15, 0.07) 0.084
C6 −1.26 (−1.77, −0.75) 2.0 × 10–6*
C7 −1.71 (−2.17, −1.24) 9.5 × 10–12*
  1. The mean effect size is provided, along with the 95% confidence interval (CI). We used Bonferroni correction to account for multiple testing. * represents statistical significance under Bonferroni correction where p < 0.05/14 = 0.0036