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Table 1 Agreement of repeated measurements for four methods in terms of ΔE and ΔE00 related to a single tooth

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

  Visual 2D Visual 3D Electronical 2D Electronical 3D
Value Value Value Value
Paired observations, number 840a 840 a 839 b 840b
Mean ΔE (standard deviation) 1.12 (1.95) 1.99 (1.95) 0.97 (1.41) 1.55 (2.11)
Agreement within ΔE < 2.7, proportion (95% CI) 80.1 (77.3–82.8)**,*** 59.4 (56.0–62.7)*,** 90.9 (88.8–92.8)***,† 71.7 (68.5–74.7)**
Agreement within ΔE < 3.7, proportion (95% CI) 84.6 (82.0–87.0)*** 77.9 (74.9–80.6)**,*** 92.8 (90.9–94.5)***,† 83.3 (80.6–85.8)***
Mean ΔE00 (standard deviation) 0.92 (1.60) 1.59 (1.58) 0.80 (1.19) 1.27 (1.74)
Agreement within ΔE00 < 2.7, proportion (95% CI) 84.2 (81.5–86.6)*** 69.5 (66.3–72.6)** 92.1 (90.1–93.9)***,† 77.4 (74.4–80.2)**,***
Agreement within ΔE00 < 3.7, proportion (95% CI) 91.9 (89.8–93.7)***,† 88.1 (85.7–90.2)*** 96.3 (94.8–97.5) 86.4 (83.9–88.7)***
  1. a V1 versus V2, V3 versus V4, V5 versus V6 acc. to the flow chart
  2. b E1 versus E2, E3 versus E4, E5 versus E6 acc. to the flow chart
  3. Classifications for the interpretation of agreement
  4. * fair [40–60); ** good [60–80); *** very good [80–92); excellent [92–100]