Table 1. Adequacy of nodal staging in Wroclaw Thoracic Surgery Centre in the investigated period from 2007 to 2017.

Year of surgery	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	P value
Number of radical resections in NSCLC	265	258	280	256	252	259	311	332	311	348	343
≥3 mediastinal stations sampled (%)	64	68	76	76	71	77	83	85	85	86	82	<0.0001
≥3 mediastinal nodes sampled (%)	81	87	92	95	92	96	96	98	98	97	98	<0.0001
Station subcarinal sampled (%)	75	84	95	95	90	90	95	98	96	95	93	<0.0001
Adequate mediastinal staging (%)	74	80	92	93	87	88	93	97	95	94	92	<0.0001
≥3 lung/hilar stations sampled (%)	3	7	37	48	50	51	48	62	62	61	64	<0.0001
≥3 lung/hilar nodes sampled (%)	71	82	87	88	90	88	91	96	94	91	91	<0.0001
Adequate lung/hilar staging (%)	72	83	88	88	90	89	92	96	94	91	91	<0.0001
Overall adequate staging (%)	62	70	82	86	87	80	86	94	89	87	85	<0.0001