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Table 4 Inter-rater measures agreement results

From: A method for quantitative measurement of lumbar intervertebral disc structures: an intra- and inter-rater agreement and reliability study

Measurement n (slices) Mean (mm) Standard deviation (mm) Mean difference (bias) [95% CI] (mm) 95% Limits of agreement (LOA) (mm) LOA as proportion of mean values (%)
Length - AIVH 257 14.9 1.2 −0.5 [−0.7; –0.4] −2.8; 1.8 30.9
Length - PIVH 257 9.6 1.2 −0.3 [−0.4; –0.2] −2.6; 2.0 47.9
Length - IVDL 257 31.2 0.8 −0.7 [−0.8; –0.6] −2.2; 0.8 9.7
Length - ADML 257 3.4 0.6 0.1 [0.0; 0.2] −1.1; 1.4 73.6
Length - PDML 257 3.4 0.9 0.3 [−0.2; 0.4] −1.5; 2.1 105.9
Length - ADSL 229 8 1.1 0.2 [0.0; 0.3] −2.0; 2.3 53.8
  n (participants) (mm2) (mm2) (mm2) (mm2) (%)
Area - CAIH 15 568.2 23.4 −18.7 [−31.7; –5.7] −64.6; 27.1 16.2
Area - CPIH 15 362.8 17.3 −13.3 [−22.9; –3.7] −47.3; 20.7 18.7
Area - CIVD 15 1190.4 13.7 −19.5 [−27.1; –11.9] −46.4; 7.4 4.5
Area - CADM 15 126.2 7 2.8 [−1.1; 6.7] −10.8; 16.4 21.6
Area - CPDM 15 121.7 15 6.4 [−2.0; 14.7] −23.1; 35.8 48.4
Area - CDS 8 286 17.8 4.8 [−10.1; 19.7] −30.1; 39.8 24.4
   (mm3) (mm3) (mm3) (mm3) (%)
Volume - VADM 15 1830.3 209 392 [277; 508] −17; 801 44.7
Volume - VPDM 15 1117.6 297 131 [−33; 296] −450; 713 104.1
  1. Number of slices measured for length and participants measured for cross-sectional area and volume measurements, overall mean values, standard deviation, mean difference between measurements (bias) with 95% confidence intervals (CI), 95% limits of agreement (LOA), and LOA as a proportion of mean values. Due to absence of dural sac at certain otherwise measured slices, a lower number of slices were measured. Participants with unequal start- and end-slices were excluded from the analyses, leading to varying numbers of included participants.