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Table 2 Risk factor differences in age groups

From: Recombinant human Bone Morphogenetic Protein-2 (rhBMP-2) in posterolateral lumbar spine fusion: complications in the elderly

Contributing factors Group 1 Group 2 Significance
  (18-64 years) (≥65 years)  
  N=250 N=232  
Gender    χ²=0.292
male 111 (44.4%) 92 (39.7%)  
female 139 (55.6%) 140 (60.3%)  
BMI(kg/m²) 32.2a (18.4-63.9) 30.5 (18.5-57.2) p=0.006
Diabetes 35 (14.0%) 49 (21.1%) χ²=0.109
Cardiovascular disease 114 (45.6%) 147 (63.4%) χ²<0.001
Respiratory disease 58 (23.2%) 40 (17.2%) χ²=0.104
Current Tobacco Use 51 (20.4%) 6 (2.6%) χ²<0.001
Allergies 121 (52.6%) 97 (46.0%) χ²=0.234
Steroid medication 53 (21.2%) 68 (29.3%) χ²=0.081
Preoperative NSAID 83 (37.7%) 107 (46.1%) χ²=0.010
Previous BMP exposure 10 (4.0%) 8 (3.4%) χ²=0.740
  1. BMI=Body Mass Index, BMP=Bone morphogenetic protein, NSAID= non-steroidal anti-inflammatory drugs.