3.

调查对象生活环境方面危险因素当前与十年前暴露情况比较

The exposure to living environmental risk factors of the respondents, comparison between nowadays and 10 years ago

	10 years ago			Nowadays		χ2	P
	n	%		n	%
High lung cancer area
Ways of domestic heating involving smoky coal combustion: Yes	571	76.85		396	53.3	90.68	< 0.001
Ventilation or using smoke exhauster during cooking: Yes	256	34.45		389	52.36	48.46	< 0.001
Fume in the kitchen during cooking: Yes	328	44.15		272	36.61	8.77	0.003
Irritation of eyes and/or throat during cooking: Yes	368	49.53		308	41.45	9.77	0.002
Annual consumption of smoky coal: ≥2 tons	382	2.98		149	20.11	170.75	< 0.001
Annual consumption of electricity: ≥700 kW·h	128	21.99		481	74.92	342.09	< 0.001
The most frequently used type of stove is fire pit without chimney: Yes	18	2.42		14	1.88	0.51	0.475
The most frequently used type of stove is stove in the ground with chimney: Yes	58	7.81		9	1.21	37.53	< 0.001
The most frequently used type of stove is tall stove with chimney: Yes	407	54.78		190	25.57	131.85	< 0.001
The most frequently used type of stove is portable stove: Yes	57	7.67		47	6.33	1.03	0.309
Median lung cancer area
Ways of domestic heating involving smoky coal combustion: Yes	772	97.97	735	93.27	20.75	< 0.001
Ventilation or using smoke exhauster during cooking: Yes	142	18.02	212	26.90	17.85	< 0.001
Fume in the kitchen during cooking: Yes	559	70.94	463	58.76	25.65	< 0.001
Irritation of eyes and/or throat during cooking: Yes	561	71.19	506	64.21	8.78	0.003
Annual consumption of smoky coal: ≥2 tons	626	80.36	599	76.21	3.96	0.046
Annual consumption of electricity: ≥700 kW·h	76	12.60	350	47.81	188.66	< 0.001
The most frequently used type of stove is fire pit without chimney: Yes	50	6.35	3	0.38	43.13	< 0.001
The most frequently used type of stove is stove in the ground with chimney: Yes	466	59.14	479	60.79	0.45	0.504
The most frequently used type of stove is tall stove with chimney: Yes	250	31.73	154	19.54	30.68	< 0.001
The most frequently used type of stove is portable stove: Yes	17	2.16	14	1.78	0.30	0.586
Low lung cancer area
Ways of domestic heating involving smoky coal combustion: Yes	757	92.88	660	80.98	50.81	< 0.001
Ventilation or using smoke exhauster during cooking: Yes	219	26.87	228	27.98	0.25	0.617
Fume in the kitchen during cooking: Yes	481	59.02	310	38.04	71.82	< 0.001
Irritation of eyes and/or throat during cooking: Yes	462	56.69	300	36.81	64.68	< 0.001
Annual consumption of smoky coal: ≥2 tons	578	71.01	443	54.36	48.27	< 0.001
Annual consumption of electricity: ≥700 kW·h	181	22.82	624	77.23	473.82	< 0.001
The most frequently used type of stove is fire pit without chimney: Yes	145	17.79	10	1.23	129.94	< 0.001
The most frequently used type of stove is stove in the ground with chimney: Yes	155	19.02	176	21.60	1.67	0.196
The most frequently used type of stove is tall stove with chimney: Yes	339	41.60	286	35.09	7.29	0.007
The most frequently used type of stove is portable stove: Yes	285	34.97	226	27.73	9.92	0.002