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Table 3 Comparison between the loosening group and non-loosening group

From: Risk factors for screw loosening in patients with adult degenerative scoliosis: the importance of paraspinal muscle degeneration

Parameters Loosening Non-loosening P value
Gender (M/F) 16/43 5/29 0.168
Age (year) 64.0 ± 6.1 62.7 ± 5.2 0.276
BMI (kg/m2) 25.5 ± 4.2 26.4 ± 4.2 0.354
Lumbar T value − 0.8 ± 1.5 − 1.1 ± 1.6 0.434
Cobb angle (°) 27.2 ± 9.2 23.6 ± 9.9 0.078
Number of fused segments 5.7 ± 1.4 5.2 ± 1.2 0.075
Operation time (min) 277.4 ± 66.6 258.4 ± 51.4 0.154
Blood loss (ml) 1142.5 ± 551.8 1180.9 ± 822.2 0.431
Hospital stay (day) 13.1 ± 8.1 11.7 ± 4.1 0.782
Lumbosacral fixation (YES/NO) 37/22 19/15 0.517
Proximal segments (T/TL/L) 10/42/7 4/23/7 0.469
Sagittal parameters
 SVA (mm) 59.4 ± 43.4 49.3 ± 28.5 0.180
 PI (°) 47.3 ± 10.0 49.6 ± 11.3 0.308
 PT (°) 23.5 ± 10.3 23.9 ± 10.5 0.861
 SS (°) 23.8 ± 8.9 25.7 ± 10.8 0.351
 LL (°) 24.9 ± 14.8 26.7 ± 17.4 0.604
 TK (°) 21.6 ± 13.1 20.0 ± 10.9 0.535
 PI-LL (°) 22.4 ± 16.4 22.9 ± 15.6 0.876
  1. BMI body mass index, SVA sagittal vertical axis, PI pelvic incidence, PT pelvic tilt, SS sacral slope, LL lumbar lordosis, TK thoracic kyphosis, PI-LL PI minus LL