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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