Table 2.

Adjusted odds ratios (ORs)^* and 95% confidence intervals (CIs) for lung cancer in relation to coal subtype used when the subject was born.

	All			Male			Female
Coal type	Cases (%)	Controls (%)	OR* (95% CI)	Cases (%)	Controls (%)	OR# (95% CI)	Cases (%)	Controls (%)	OR& (95% CI)
Smokeless coal or wood	23 (5)	146 (30)	1	14 (5)	77 (30)	1	9 (4)	69 (29)	1
Smoky coal	475 (95)	351 (70)	7.7 (4.5–13.3)	246 (95)	182 (70)	9.0 (4.1–19.8)	229 (96)	169 (71)	6.7 (3.2–14.2)
Smoky coal subtypes
Laibin	276 (55)	64 (13)	24.8 (12.4–49.6)	143 (55)	36 (14)	25.2 (9.4–67.3)	133 (56)	28 (12)	26.4 (9.6–72.6)
Longtan	44 (9)	24 (5)	11.6 (5.0–27.2)	24 (9)	13 (5)	14.8 (4.2–51.5)	20 (8)	11 (5)	9.4 (2.8–31.1)
Baoshan	12 (2)	17 (3)	6.0 (2.2–16.7)	6 (2)	12 (5)	5.8 (1.4–23.9)	6 (3)	5 (2)	6.6 (1.4–30.5)
Longchang	42 (8)	51 (10)	4.1 (2.0–8.6)	16 (6)	16 (6)	7.4 (2.2–24.5)	26 (11)	35 (15)	2.9 (1.1–7.6)
Yangchang	47 (9)	56 (11)	3.8 (1.8–8.3)	28 (11)	31 (12)	4.9 (1.6–15.4)	19 (8)	25 (11)	3.1 (1.0–9.4)
Wenxing	14 (3)	27 (5)	3.8 (1.4–10.5)	6 (2)	12 (5)	4.6 (1.0–22.0)	8 (3)	15 (6)	3.4 (0.9–13.3)
Tangtang	18 (4)	30 (6)	2.8 (1.2–6.6)	6 (2)	14 (5)	3.6 (0.9–14.2)	12 (5)	16 (7)	2.2 (0.6–7.5)
Shuanghe	4 (1)	21 (4)	1.1 (0.2–4.7)	2 (1)	14 (5)	1.2 (0.2–8.6)	2 (1)	7 (3)	0.9 (0.1–10.9)
Tianba	9 (2)	41 (8)	0.6 (0.2–1.9)	8 (3)	23 (9)	1.0 (0.2–4.4)	1 (0)	18 (8)	0.2 (0.02–2.1)
Yangliu	3 (1)	14 (3)	0.7 (0.2–3.1)	1 (0)	6 (2)	0.5 (0.1–5.2)	2 (1)	8 (3)	0.9 (0.1–6.0)

^*Adjusted for age, sex, literacy, lung cancer in first-degree relatives, hours spent at home per day, coal mine work history, tobacco use, and passive smoke exposure history.

^#Adjusted for the same variables as in *, with exception of sex.

^&Adjusted for the same variables as in *, with exception of sex, coal mine work history, and smoking.