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Table 2 Subgroup comparison of clinical parameters

From: Influence of screw density on thoracic kyphosis restoration in hypokyphotic adolescent idiopathic scoliosis

Variable Group 1 (Postop TK ≥ 20°) Group 2 (Postop TK<20°) P value
Gender (female/male) 13/4 32/8 0.765
Age at surgery (year) 14.41 ± 1.50 14.38 ± 1.96 0.945
Rod diameter (5.5 mm/6.0 mm) 4/13 15/25 0.306
Rod material (Ti/CoCr) 7/10 28/12 0.041
Fused levels 12.18 ± 1.33 11.38 ± 1.69 0.088
Total screw number 18.06 ± 3.82 16.43 ± 3.53 0.124
Screw number of concave side 10.35 ± 1.73 9.15 ± 1.90 0.029
Screw number of convex side 7.71 ± 2.37 7.28 ± 2.03 0.488
Total screw density 1.49 ± 0.28 1.45 ± 0.25 0.637
Screw density of concave side 0.85 ± 0.13 0.81 ± 0.14 0.279
Screw density of convex side 0.63 ± 0.18 0.64 ± 0.15 0.854
  1. Values are mean ± standard deviation, number of participants, or as otherwise indicated
  2. Ti indicates titanium, CoCr cobalt chromium