Table 1 Mean ± standard deviation (range) [95% confidence interval] of different parameters for the five devices

K1 (D)

43.45 ± 1.40

(39.83–46.08)

[43.07–43.84]

n = 51

43.53 ± 1.39

(39.76–46.15)

[43.15–43.91]

n = 51

43.49 ± 1.41

(39.84–46.58)

[43.10–43.88]

n = 51

43.38 ± 1.29

(39.60–46.00)

[43.03–43.73]

n = 51

NA

0.005*

K2 (D)

44.43 ± 1.39

(40.48–48.10)

[44.05–44.81]

n = 51

44.60 ± 1.35

(40.55–48.20)

[44.23–44.97]

n = 51

44.38 ± 1.32

(40.30–48.20)

[44.02–44.74]

n = 51

NA

 < 0.001*

WTW (mm)

11.67 ± 0.40

(10.40–12.49)

[11.56–11.78]

n = 51

11.85 ± 0.37

(11.10–12.59)

[11.75–11.95]

n = 51

11.79 ± 0.38

(10.50–12.60)

[11.68–11.89]

n = 48

NA

 < 0.001*

ACD (mm)

3.22 ± 0.37

(2.41–4.16)

[3.12–3.33]

n = 51

3.28 ± 0.37

(2.52–4.13)

[3.17–3.38]

n = 51

3.14 ± 0.37

(2.31–4.02)

[3.04–3.24]

n = 51

3.20 ± 0.38

(2.40–4.07)

[3.09–3.30]

n = 51

NA

 < 0.001*

LT (mm)

4.59 ± 0.37

(3.61–5.29)

[4.49–4.70]

n = 47

4.60 ± 0.42

(3.56–5.93)

[4.48–4.72]

n = 51

4.58 ± 0.41

(3.62–5.94)

[4.46–4.69]

n = 51

NA

NA

 < 0.001*

AL (mm)

23.77 ± 1.56

(20.60–28.51)

[23.33–24.21]

n = 48

23.94 ± 1.97

(20.67–33.22)

[23.40–24.48]

n = 51

23.98 ± 2.06

(20.64–33.70)

[23.41–24.55]

n = 50

23.95 ± 1.74

(22.16–29.33)

[23.34–24.56]

n = 31

23.78 ± 1.98

(19.86–33.01)

[23.23–24.32]

n = 51

 < 0.001*