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Table 3 Comparing methods of measurements in terms of ΔE and ΔE00: 2D versus 3D within visual or electronical measurement; visual versus electronical measurements within 2D and 3D

From: New insights in the reproducibility of visual and electronic tooth color assessment for dental practice

  Visual versus electronical 2D versus 3D
within 2D within 3D within visual within electronical
Value Value Value Value
Paired observations, number 839a 840a 1680b 1679c
Mean ΔE (standard deviation) 2.53 (2.17) 2.99 (2.21) 3.46 (1.66) 3.91 (1.29)
Agreement within ΔE < 2.7, proportion (95% CI) 59.6 (56.2–62.9)*,** 40.6 (37.3–44.0)-,* 45.2 (42.8–47.6)* 18.6 (16.7–20.5)--,-
Agreement within ΔE < 3.7, proportion (95% CI) 67.2 (63.9–70.4)** 68.5 (65.3–71.7)** 52.9 (50.5–55.3)* 46.6 (44.2–49.0)*
Mean ΔE00 (standard deviation) 2.08 (1.80) 2.37 (1.82) 3.26 (1.23) 3.50 (1.00)
Agreement within ΔE00 < 2.7, proportion (95% CI) 62.9 (59.6–65.5)*,** 56.0 (52.5–59.3)* 45.8 (43.4–48.2)* 23.5 (21.5–25.6)
Agreement within ΔE00 < 3.7, proportion (95% CI) 82.1 (79.4–84.7)**,*** 75.2 (72.2–78.1)** 71.7 (69.5–73.9)** 64.6 (62.3–66.9)**
  1. a V2 versus E1, V3 versus E3, V5 versus E5 acc. to the flow chart
  2. b D2 versus D3 measurements for V1 – V6 acc. to the flow chart
  3. c D2 versus D3 measurements for E1 – E6 acc. to the flow chart
  4. Classifications for the interpretation of agreement
  5. −− poor < 20; slight [20–40); * fair [40–60); ** good [60–80); *** very good [80–92)