2.

吸烟包年与肺癌病理组织分型构成比（%）及变化趋势

Distribution and trend of histology in diffident smoking pack-years of lung cancer patients

Pack-years	Total	Year of diagnosis													APC
		2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012
*: P < 0.05.
SCC
< 10	32.21	42.50	32.35	41.36	39.73	34.48	32.97	29.00	35.28	36.67	31.36	28.90	27.06	25.34	-3.3*
10-19	31.93	20.69	34.48	39.47	37.14	42.00	39.13	26.76	32.84	31.88	31.94	35.71	24.27	26.97	-2.8
≥20	44.41	47.90	48.06	47.76	45.96	47.39	47.96	45.27	42.88	44.66	44.66	41.68	42.84	41.11	-1.3*
ADC
< 10	32.31	15.00	20.59	24.61	21.23	27.01	26.09	31.33	36.92	28.25	31.14	36.80	37.42	46.83	6.5*
10-19	39.13	24.14	24.14	15.79	14.29	44.00	26.09	46.48	32.84	47.83	36.11	42.86	54.37	49.44	4.8*
≥20	27.34	14.29	14.73	17.95	20.50	23.22	22.04	24.73	29.21	28.45	25.77	30.16	33.12	38.71	7.1*
SCLC
< 10	18.88	13.33	19.12	10.99	12.33	14.94	15.58	23.67	15.42	20.27	19.52	20.23	24.74	19.83	3.6*
10-19	13.54	27.59	13.79	7.89	14.29	6.00	20.29	9.86	17.91	8.70	16.67	14.29	13.59	10.11	-5.0*
≥20	13.86	15.55	13.95	12.82	12.11	8.29	13.06	16.73	15.90	14.14	15.37	13.27	15.60	11.60	0.2