Confounders | Subgroups | Rod(s) fracture | Odds ratio (95 % Cl: min; max) | P(χ2) | |
---|---|---|---|---|---|
Yes | No | ||||
Gender | Female | 3 | 47 | 0.3 (0.07; 1.6) | 0.2 |
Male | 4 | 21 | |||
Age | 24–59 years | 2 | 33 |  |  |
 | 60–82 years | 5 | 35 | 0.4 (0.08; 2.3) | 0.3 |
Ethnicity | Caucasian | 6 | 60 | N/A | >0.5 |
Hispanic | 0 | 4 | |||
Refused | 1 | 4 | |||
Body mass index (BMI) | >30 | 2 | 14 | 1.2 (0.2; 6.7) | >0.5 |
≤30 | 5 | 41 | |||
Previous thoracolumbar surgery | Primary | 0 | 16 | N/A | 0.3 |
Reoperation | 7 | 52 | |||
Smoking status | Never smoker | 3 | 30 | 0.9 (0.2; 4.2) | >0.5 |
Ever smoker | 4 | 35 | |||
Pseudarthrosis present at operation | Yes | 2 | 13 | 1.7 (0.3; 9.7) | >0.5 |
No | 5 | 55 |