Table 2.

Distribution of number of lymph nodes examined in patients with pN0, pN1, and pN2 non-small cell lung cancer.^*

Stations	Mean	Median	IQR	Range	P
Mediastinal (2–9)†
All patients, n=513	13.6	12	8–17	1–64	0.19
pN0, n=435	13.5	11	8–17	1–64	Ref
pN1, n=60	13.1	12	7–15	2–42	0.68
pN2, n=17	17.1	17	11–23	6–30	0.079
Hilar (10)†
All patients, n=489	2.4	2	1–3	1–14	0.6
pN0, n=415	2.4	2	1–3	1–14	Ref
pN1, n=57	2.7	2	1–3	1–14	0.33
pN2, n=16	2.6	1	1–3	1–9	0.75
Hilar/mediastinal (2–10)†
All patients, n=513	15.9	14	10–20	1–71	0.24
pN0, n=435	15.8	14	10–20	1–71	Ref
pN1, n=60	15.6	14	9.5–19	2–44	0.88
pN2, n=17	19.5	18	12–25	7–39	0.094
Non-hilar N1 (11–14)‡
All, n=445	4.8	4	2–7	1–30	0.007
pN0, n=373	4.6	4	2–6	1–28	Ref
pN1, n=56	6.1	4	3–7	1–30	0.01
pN2, n=15	6.7	5	3–9	1–19	0.046
N1 (10–14)
All, n=507	6.6	5	3–9	1–37	0.002
pN0, n=430	6.3	5	3–8	1–37	Ref
pN1, n=59	8.3	7	4–11	1–34	0.001
pN2, n=17	8.3	8	4–10	1–25	0.078
All stations (2–14)
All, n=513	20.1	19	13–24	1–83	0.066
pN0, n=435	19.7	18	13–24	1–83	Ref
pN1, n=60	21.3	19	14–25	2–64	0.3
pN2, n=17	25.4	23	17–28	10–53	0.031

^*Not all numbers add to 513 due to missing data for certain characteristics;

^†dependent on surgical collection;

^‡dependent on pathology processes.