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Table 1 Comparison of patient characteristics between K-line (+) group and K-line (-) group

From: Influence of K-line on intraoperative and hidden blood loss in patients with ossification of the posterior longitudinal ligament when undergoing unilateral open-door laminoplasty

  K-line (+) group K-line (-)group P value
Age 59.5 ± 11.8 62.8 ± 10.3 0.293
Gender (M/F) 63/12 23/10 0.119
BMI 24.9 ± 3.5 25.4 ± 3.6 0.641
Classification of OPLL    0.748
 Continuous 15 7  
 Segmental 10 3  
 Mixed 39 20  
 Localized 11 3  
Medication history
 Hypertension 32 (42.7%) 18 (54.5%) 0.298
 Diabetes mellitus 22 (29.3%) 12 (36.4%) 0.505
 Cardiovascular disease 15 (20%) 8 (24.2%) 0.618
OOR (%) 42.3 ± 10.1 49.5 ± 15.3 0.006
C2-7 lordosis (°) 12.4 ± 9.7 9.9 ± 10.1 0.217
Preoperative Hb (g/L) 13.2 ± 1.8 13.8 ± 1.6 0.650
Preoperative HCT (%) 40.1 ± 3.2 41.5 ± 2.8 0.598