Effect modification of patients with concurrent fibular pseudarthrosis on the risk of ankle valgus compared with those without concurrent fibular pseudarthrosis, stratified by NF-1, CPT location, age of patient undergoing surgery and LLD
| OR (95% CI) | P value | |
| CPT location | ||
| Proximal 2/3 | 1.580 (0.563 to 4.431) | 0.3850 |
| Distal 1/3 | 2.195 (1.154 to 4.175) | 0.0166 |
| Age of patient undergoing surgery (years) | ||
| <3 | 2.485 (1.188 to 5.200) | 0.0157 |
| ≥3 | 1.392 (0.604 to 3.208) | 0.4370 |
| LLD (cm) | ||
| <2 | 2.478 (1.225 to 5.015) | 0.0116 |
| ≥2 | 1.035 (0.394 to 2.723) | 0.9441 |
| NF-1 | ||
| No | 0.981 (0.335 to 2.871) | 0.9725 |
| Yes | 2.836 (1.517 to 5.303) | 0.0011 |
Above models adjusted for: sex, BMI, fracture age, age of patient undergoing surgery, surgery method, NF-1, LLD, CPT location, and fibular cystic change. In each case, the model was not adjusted for stratification variable itself.
BMI, body mass index; CPT, congenital pseudarthrosis of the tibia; LLD, limb-length discrepancy; NF-1, type 1 neurofibromatosis.