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Table 3 Multiple testing of the critical SI angle (CSIA) when compared to feasibility of iliosacral screw insertion. Significance level (p value) has to be corrected according to Bonferroni: significant p value < 0.017

From: Feasibility of iliosacral screw placement in patients with upper sacral dysplasia

 

Impossible (group 1)

Feasible (group 2)

Limited feasible (group 3)

Group 1 vs. 2

Adjusted difference (95% CI), p value

Group 1 vs. 3

Adjusted difference (95% CI), p value

Group 3 vs. 2

Adjusted difference (95% CI), p value

CSIA left (°)

n = 9

−29.3 (−31.7 to −29.2)

n = 69

−2.9 (−10.4 to 9.6)

n = 18

−16.3 (−22.4 to −9.4)

23.8 (14.0 to 33.5)

p < 0.001

8.4 (−2.8 to 1936)

p = 0.134

13.8 (6.8 to 20.8)

p < 0.001

CSIA right (°)

n = 12

−23.0 (−27.3 to −16.2)

n = 66

−2.5 (−10.1 to 10.1)

n = 18

−14.6 (−19.6 to −8.1)

19.1 (10.5 to 27.8)

p < 0.001

4.9 (−4.5 to 14.3)

p = 0.294

11.3 (3.8 to 18.8)

p = 0.004