Table 2 Agreement and reliability of repeated measurements for four methods in terms of the distance from 0M1 related to a single tooth

Number of paired observations

840^a

840^a

839^b

840^b

Mean distance (SD) d₁ from 0M1 for the 1st measurement

15.0 (3.28)

13.4 (2.89)

15.8 (2.97)

13.1 (3.69)

Mean distance (SD) d₂ from 0M1 for the 2nd measurement

14.9 (3.23)

13.3 (2.76)

15.9 (2.94)

13.4 (3.73)

Pooled SD of the 1st and 2nd measurement

3.25

2.83

2.96

3.71

Difference d₂ – d₁ (standard deviation)

−0.17 (1.98)

−0.08 (2.11)

0.09 (1.42)

0.26 (2.09)

Agreement within |d(0M1)|  < 2.7, proportion (95% CI)

83.7 (81.0–86.1)^***

70.6 (67.4–73.7)^**

93.6 (91.7–95.1)^***,†

77.3 (74.3–80.1)^**,***

Agreement within |d(0M1)|  < 3.7, proportion (95% CI)

94.0 (92.2–95.6)^†

94.0 (92.2–95.6)^†

97.0 (95.6–98.1)^†

93.1 (91.2–94.7)^***,†

Limits of agreement

−4.04 – 3.70

− 4.21 – 4.06

−2.70 – 2.88

−3.84 – 4.36

Number of observations outside the limits of agreement total (lower; higher); expected: 30–55

50 (38; 12)

38 (13; 25)

53 (26; 27)

52 (20; 32)

Largest mean d(0M1) value

22.2

20.7

24.8

24.9

Smallest mean d(0M1) value

11.2

7.3

11.2

3.3

SEM_(2,1)

1.400

1.489

1.007

1.489

SEM_(3,1)

1.396

1.489

1.005

1.479

SDCD_(2,1)

3.88

4.13

2.79

4.13

SDCD_(3,1)

3.87

4.13

2.79

4.10

ICC_(1,1) (95% CI)

0.81 (0.79–0.84)^**,***

0.72 (0.69–0.75)^**

0.88 (0.87–0.90)^***

0.84 (0.82–0.86)^***

ICC_(2,1) (95% CI)

0.81 (0.79–0.84)^**,***

0.72 (0.69–0.75)^**

0.88 (0.87–0.90)^***

0.84 (0.82–0.86)^***

ICC_(3,1) (95% CI)

0.82 (0.79–0.84)^**,***

0.72 (0.69–0.75)^**

0.88 (0.87–0.90)^***

0.84 (0.82–0.86)^***