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Table 2 Reliability of radiographic measurements (ICC = intraclass correlation coefficient, CI = confidence interval, LoA - limits of agreement).

From: Radiographic correlates of hallux valgus severity in older people

Radiographic observations Relative reliability ICC (95% CI) Absolute reliability Mean difference (95% LoA)
Hallux abductus angle 0.95 (0.90 to 0.97) -0.10 (-6.26 to 6.06)
Hallux abductus interphalangeal angle 0.66 (0.44 to 0.80) -0.98 (-11.26 to 9.32)
Proximal articular set angle 0.90 (0.82 to 0.94) -0.53 (-6.86 to 5.81)
Intermetatarsal angle 0.83 (0.70 to 0.90) -0.05 (-3.43 to 3.33)
Four grade sesamoid scale Weighted kappa = 0.86 NA
Seven position sesamoid scale Weighted kappa = 0.90 NA
Difference in lengths of first and second metatarsals 0.89 (0.81 to 0.94) -0.10 (-2.72 to 2.52)
Metatarsus adductus angle 0.91 (0.84 to 0.95) -0.50 (-4.62 to 3.62)
Simplified metatarsus adductus angle 0.88 (0.79 to 0.94) 0.53 (-5.26 to 6.31)
Hallux abductus angle (Miller technique) 0.94 (0.89 to 0.97) 0.03 (-6.18 to 6.23)
Distal articular set angle 0.73 (0.54 to 0.84) 0.30 (-6.30 to 6.90)
Congruency of first MPJ Weighted Kappa = 0.75 NA
Shape of the first metatarsal head Kappa = 0.69 NA
First metatarsal declination angle 0.81 (0.66 to 0.89) 0.28 (-3.46 to 4.01)
Lateral intermetatarsal angle 0.90 (0.83 to 0.95) 0.03 (-2.30 to 2.35)
Calcaneal inclination angle 0.95 (0.92 to 0.97) 0.10 (-2.80 to 3.00)
Navicular height 0.89 (0.79 to 0.94) -0.35 (-5.26 to 4.56)
Truncated foot length 0.99 (0.93 to 0.99) -0.13 (-2.12 to 1.87)
Navicular height/truncated foot length 0.89 (0.80 to 0.94) 0.00 (-0.03 to 0.03)