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Table 1 Correlation between tutors and learners for each DUS parameter and correlation comparison between groups

From: Comparisons of two diaphragm ultrasound-teaching programs: a multicenter randomized controlled educational study

Parameter Intervention group Control group Correlation comparison
Learners (n) ρ [95% CI] p value Learners (n) ρ [95% CI] p value z value p value
DD 80 0.973 [0.958–0.983] < 0.0001 50 0.802 [0.675–0.883] < 0.0001 − 5627 < 0.0001
Thickinsp 81 0.949 [0.921–0.976] < 0.0001 58 0.209 [− 0.052–0.444] 0.115 − 9.141 < 0.0001
Thickexp 81 0.938 [0.905–0.960] < 0.0001 58 0.310 [0.057–0.526] 0.018 − 7.955 < 0.0001
TF 81 0.975 [0.961–0.960] < 0.0001 58 − 0.028 [− 0.284–0.232] 0.836 − 12.061 < 0.0001
  1. DUS, diaphragm ultrasound; ρ, correlation coefficient; 95% CI, 95% confidence interval; DD, diaphragm displacement; Thickinsp, diaphragm thickness at inspiration; Thickexp, diaphragm thickness at expiration; TF, thickening fraction