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

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

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

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

ISSN: 1477-7819