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. Author manuscript; available in PMC: 2013 Aug 1.
Published in final edited form as: Osteoarthritis Cartilage. 2012 Apr 17;20(8):869–879. doi: 10.1016/j.joca.2012.04.005

Table 2.

Re-measurement error (precision) for mean cartilage thickness over the total area of bone (ThCtAB.Me) from unpaired analyses represented as RMSE CV%, for each cartilage plate, analysis team and acquisition for (A) medial and lateral tibia, (B) medial and lateral central femur. The combined (pooled data) RMSE CV% for a plate and acquisition combination were computed with and without the results from outlier teams. Metrics where a significant team effect on precision was observed had outlier teams identified by results that differed significantly from at least 2 other teams in pair-wise comparisons. Two isolated test-retest outlier pairs for ThCtAB.Me were excluded from MT analyses of DESS-MPR, for cMF and cLF analyses of FLASH and from cMF analyses of DESS-MPR.

(A) Medial and Lateral Tibia (MT and LT) mean cartilage thickness over the total area of bone (ThCtAB.Me)
MT LT
Analysis
Team
FLASH DESS-
MPR
DESS FLASH DESS-
MPR
DESS
B 1.8% 3.1% 2.9% 2.3% 2.2% 2.0%
C 3.1% 3.4% 2.1% 3.4% 2.4% 2.7%
D -- -- -- -- -- --
E 6.8% 7.3% (4.7%) 3.0% 4.1% 4.6% 3.1%
Pooled, without isolated outlier data points - 3.6% (0.08) - - - -
Pooled, without outlier team - 3.3% - - - -
Pooled (p-value for team effect) [RMSE mm] 4.6% (0.06) [0.09] 5.1% 1 (0.04) [0.09] 2.7% (0.89) [0.05] 3.4% (0.64) [0.08] 3.4% (0.07) [0.08] 2.6% (0.02) [0.06]
(B) Central Medial and Lateral Femur (cMF and cLF) mean cartilage thickness over the total area of bone (ThCtAB.Me)
cMF cLF
Analysis
Team
FLASH DESS-
MPR
DESS FLASH DESS-
MPR
DESS
B 2.4% 3.7% 2.8% 3.8% 3.7% 2.9%
C 4.5% 4.5% 3.0% 4.1% 3.8% 3.4%
D 3.5% 4.0% 1.8% 3.4% 3.1% 2.8%
E 7.6% (5.9%) 9.7% (7.6%) 4.8% 6.8% (5.6%) 6.6% 6.6%
Pooled, without isolated outlier data points 4.1% (0.11) 5.1% (0.14) - 4.2% (0.14) - -
Pooled, without outlier team - - - - 3.5% 3.0%
Pooled (p-value for team effect) [RMSE mm] 4.7% (0.06) [0.09] 5.9% (0.06) [0.11] 3.3% †† (0.05) [0.06] 4.6% (0.13) [0.08] 4.4% 2 (0.004) [0.08] 4.2% 2 (0.04) [0.08]
††

P<0.01 for acquisition differences within a plate, all teams combined. DESS-MPR versus FLASH, P= 0.07; DESS-MPR versus DESS P<0.01.

1

Team B and C differ (p<0.05) from E; after outlier data point removal B–C=0.12 and C–E=0.03

2

Team B and D differ (p<0.05) from E; after outlier data point removal MPR: B–E=0.01 and D–E=0.006, DESS: B–E=0.02, and D–E=0.009