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Table 4 Details of the predictive model to calculate the probability of PAL

From: Construction and validation of a nomogram for predicting prolonged air leak after minimally invasive pulmonary resection

Risk factors Coefficient SE OR (95% CI) P
Intercept − 0.276 0.849 0.759 0.745
Age 0.024 0.007 1.024 (1.009–1.038) 0.001
BMI − 0.125 0.024 0.883 (0.842–0.926) < 0.001
Smoking history     0.002
 Non-smoker Ref.    
 Smoker 0.482 0.158 1.620 (1.188–2.208)  
FEV1% predicted − 0.012 0.004 0.988 (0.980–0.996) 0.004
Surgical procedure     < 0.001
 Sublobectomy Ref.    
 Lobectomy 0.870 0.165 2.388 (1.730–3.296)  
Surgical range     0.002
 Mono-lobe Ref.    
 Multi-lobe 0.596 0.188 1.814 (1.255–2.623)  
Operation side     0.032
 Left-sided Ref.    
 Right-sided − 0.315 0.147 0.730 (0.547–0.972)  
Operation duration 0.009 0.002 1.009 (1.005–1.012) < 0.001
  1. PAL prolonged air leak, BMI body mass index, FEV1 forced expiratory volume in one second, SE standard error, OR odds ratio, CI confidence interval. Probability of PAL could be calculated by using the following formula: ln (p/1 − p) = 0.024 × age – 0.125 × BMI + 0.482 × smoking history (non-smoker = 0; smoker = 1) – 0.012 × FEV1% predicted + 0.870 × surgical procedure (sublobectomy = 0; lobectomy = 1) + 0.596 × surgical range (mono-lobe = 0; multi-lobe = 1) – 0.315 × operation side (left = 0; right = 1) + 0.009 × operation duration – 0.276