highly significantp < 0.001
Comparison of first and second scoring of rater LS (intra-observer agreement) exceeded 0.9 for all continuous outcome measures (“qualitative assessment”: ICC agreement = 0.90, with a 95% CI from 0.87 to 0.93; “brow raised”: ICC agreement = 0.94 with a 95% CI from 0.92 to 0.96; “number”: ICC agreement = 0.97, with a 95% CI from 0.96 to 0.98; “angle”: ICC agreement = 0.97, with a 95% CI from 0.96 to 0.98) and 0.8 for the categorical outcome measure (“markedness”: κ = 0.92) with all p -values being highly significant ( p < 0.001).