Table 3.
Inter-rater measures’ agreement results based on different measurement methods on disc height.
| Level | N | SD | Mean difference (95 % CI) | 95 % LOA | LOA as proportion of mean values (%) | |
|---|---|---|---|---|---|---|
| Method 1 | L1-L2 | 332 | 5.82 | −1.59 (−1.89, −1.31) * | −7.18, 3.80 | 40.9 |
| L2-L3 | 332 | 5.52 | −1.79 (−2.13, −1.48) * | −7.43, 3.85 | 35 | |
| L3-L4 | 332 | 5.82 | −1.60 (−1.88, −1.30) * | −6.89, 3.69 | 36 | |
| L4-L5 | 332 | 5.95 | −1.40 (−1.66, −1.14) * | −6.03, 3.23 | 24 | |
| L5-S1 | 332 | 2.36 | −1.12 (−1.38, −0.87) * | −5.75, 3.51 | 46 | |
| Method 2 | L1-L2 | 332 | 1.83 | −0.84 (−1.05, −0.64) * | −4.42, 2.75 | 35 |
| L2-L3 | 332 | 1.69 | −0.77 (−0.96, −0.06) * | −4.08, 2.54 | 38 | |
| L3-L4 | 332 | 1.96 | −1.04 (−1.26, −0.84) * | −4.88, 2.80 | 40 | |
| L4-L5 | 332 | 2.10 | −0.86 (−1.10, 0.65) | −4.98, 3,26 | 46 | |
| L5-S1 | 332 | 2.29 | −1.10 (−1.34, −0.86) * | −5.59, 3.39 | 44.5 | |
| Method 3_ADH | L1-L2 | 332 | 2.08 | −0.97 (−1.22, −0.76) * | −5.05, 3.11 | 37 |
| L2-L3 | 332 | 2.17 | −1.00 (−1.25, −0.79) * | −5.25, 3.25 | 48 | |
| L3-L4 | 332 | 2.41 | −1.23 (−1.51, −0.99) * | −5.95, 3.49 | 45 | |
| L4-L5 | 332 | 2.76 | −1.15 (−1.45, −0.87) * | −6.56, 4.26 | 35 | |
| L5-S1 | 332 | 2.93 | −1.16 (−1.48, −0.83) * | −6.90, 4.58 | 33 | |
| Method 3_PDH | L1-L2 | 332 | 2.27 | −0.70 (−0.95, −0.49) * | −5.15, 3.75 | 63 |
| L2-L3 | 332 | 1.67 | −0.55 (−0.72, −0.37) * | −3.82, 2.72 | 65 | |
| L3-L4 | 332 | 1.92 | −0.84 (−1.06, −0.65) * | −4.60, 2.92 | 72 | |
| L4-L5 | 332 | 2.29 | −0.58 (−0.82, −0.33) * | −5.07, 3.91 | 75 | |
| L5-S1 | 332 | 2.34 | −1.06 (−1.33, −0.81) * | −5.65, 3.53 | 72 | |
| Method 4 | L1-L2 | 332 | 2.99 | −1.37 (−1.73, −1.05) * | −7.23, 4.49 | 73 |
| L2-L3 | 332 | 2.88 | −1.52 (−1.54, −1.22) * | −7.16, 4.12 | 80 | |
| L3-L4 | 332 | 2.53 | −1.27 (−1.55, −1.02) * | −6.23, 3.69 | 67 | |
| L4-L5 | 332 | 2.76 | −1.14 (−1.46, −0.87) * | −6.55, 4.27 | 66 | |
| Method 5_ADML | L1-L2 | 332 | 3.77 | −1.70 (−2.08, −1.26) * | −9.09, 5.69 | 67 |
| L2-L3 | 332 | 4.68 | −1.17 (−1.68, −0.68) * | −10.34, 8.00 | 78 | |
| L3-L4 | 332 | 3.83 | −1.72 (−2.14, −1.31) * | −9.23, 5.79 | 80 | |
| L4-L5 | 332 | 5.31 | −1.63 (−2.30, −1.09) * | −11.10, 8.78 | 77 | |
| L5-S1 | 332 | 4.83 | −1.04 (−1.57, 0.51) | −10.51, 8.43 | 66 | |
| Method 5_PDML | L1-L2 | 332 | 2.76 | −0.13 (−0.44, −0.18) * | −5.53, 5.28 | 84 |
| L2-L3 | 332 | 0.77 | −0.28 (−0.36, −0.21) * | −1.79, 1.23 | 86.5 | |
| L3-L4 | 332 | 3.15 | −1.27 (−1.58, −0.92) * | −7.44, 4.90 | 64.9 | |
| L4-L5 | 332 | 6.01 | −1.62 (−2.25, −0.91) * | −13.40, 10.16 | 84 | |
| L5-S1 | 332 | 2.13 | −0.49 (−0.72, −0.26) * | −4.66, 3.68 | 89 | |
| Method 6 | L1-L2 | 332 | 1.98 | −1.09 (−1.30, −0.87) * | −4.97, 2.79 | 46.1 |
| L2-L3 | 332 | 1.98 | −1.11 (−1.32, −0.91) * | −0.10, 0.06 | 45.7 | |
| L3-L4 | 332 | 2.10 | −1.22 (−1.46, −1.01) * | −5.34, 2.90 | 35 | |
| L4-L5 | 332 | 2.02 | −1.04 (−1.27, −0.84) * | −5.00, 2.92 | 40 | |
| L5-S1 | 332 | 2.21 | −1.11 (−1.34, −0.87) * | −5.44, 3.22 | 45 | |
| Method 7 | L1-L2 | 332 | 0.22 | 0.00 (0.00, 0.01) * | −0.08, 0.08 | 49.3 |
| L2-L3 | 332 | 0.10 | 0.01 (0.00, 0.01) * | −0.03, 0.05 | 28.6 | |
| L3-L4 | 332 | 0.20 | 0.00 (0.00, 0.01) * | −0.04, 0.04 | 27.6 | |
| L4-L5 | 332 | 0.14 | 0.00 (0.00, 0.01) * | −0.10, 0.10 | 44.5 | |
| L5-S1 | 332 | 0.07 | 0.00 (−0.01, 0.01) | −0.14, 0.14 | 40 | |
| Method 8 | L1-L2 | 332 | 0.12 | 0.00 (0.00, 0.01) * | −0.08, 0.08 | 44.5 |
| L2-L3 | 332 | 0.06 | 0.01 (0.00, 0.01) * | −0.03, 0.05 | 28.6 | |
| L3-L4 | 332 | 0.10 | 0.00 (0.00, 0.01) * | −0.04, 0.04 | 27.6 | |
| L4-L5 | 332 | 0.08 | 0.00 (0.00, 0.01) * | −0.10, 0.10 | 44.5 |
N: number of levels; SD: standard deviation; CI: confidence intervals; LOA: Limits of Agreement; ADH: anterior disc height; PDH: posterior disc height; ADML: anterior disc material length; PDML: posterior disc material length; * Bias was considered present if the 95 % CI did not include zero. The proportion lower than 50 % was regarded as an acceptable precision.