Association between Coalmine Dust and Mortality Risk of Lung Cancer: A Meta-Analysis

Table 1

The main features of 22 enrolled studies in this meta-analysis.

Study	Year	Area	Observed deaths	Duration of follow-up (years)	Outcome type	Outcome with 95% confidence interval	Control group	Case group	Type of research	Quality assessment
Ames RG	1983	US	NA	16	OR	0.89 (0.66, 1.20)	Coalminers	Coalminers	CC	8
Attfield MD	2008	US	331	2	SMR	1.07 (0.95, 1.19)	GP	Coalminers	DS	9
Boyd JT	1970	UK	39	19	PMR	0.84 (0.60, 1.15)	GP	Coalminers	DS	8
Coggon D	1995	UK	4610	9	PMR	0.92 (0.89, 0.94)	GP	Coalminers	DS	6
Costello J	1974	US	24	9	SMR	0.67 (0.43, 0.99)	GP	Coalminers	DS	7
Enterline PE	1964	US	161	1	SMR	1.92 (1.63, 2.24)	GP	Coalminers	DS	6
Enterline PE	1972	US	4	25	SMR	1.11 (0.30, 2.85)	GP	Coalminers	DS	8
Goldman KP	1965	UK	30	1	SMR	0.81 (0.55, 1.16)	GP	Coalminers	DS	5
Goldman KP	1965	UK	54	1	SMR	0.92 (0.69, 1.19)	Quarrymen	Coalminers	DS	5
Goldman KP	1965	UK	216	5	SMR	0.70 (0.61, 0.80)	Quarrymen	Coalminers	DS	5
Graber JM	2014	US	568	38	SMR	1.08 (1.00, 1.18)	GP	Coalminers	CS	9
Guo P	1994	China	61	9	SMR	5.56 (4.26, 7.15)	GP	CM	CS	8
Hrubec Z	1995	US	26	26	RR	1.30 (0.91, 1.74)	GP	Coalminers	DS	7
Kuempel ED	1995	US	65	10	SMR	0.77 (0.60, 0.99)	Coalminers	Coalminers	CS	9
Miller BG	2009	UK	958	21	SMR	0.99 (0.93, 1.05)	GP	Coalminers	CS	9
OPCS	1978	UK	843	2	PMR	1.15 (1.07, 1.23)	GP	Coalminers	DS	6
Rockette	1977	US	352	12	SMR	1.13 (1.02, 1.26)	GP	Coalminers	CS	9
Swaen GMH	1995	Netherlands	272	37	SMR	1.02 (0.90, 1.12)	GP	CM	CC	7
Tomášková H	2017	Czech	116	21	SMR	1.70 (1.41, 2.04)	GP	CM	CS	8
Tomášková H	2017	Czech	143	21	SMR	0.83 (0.70, 0.98)	GP	Coalminers	CS	9
Wang JW	1988	China	36	11	RR	3.69 (2.00, 6.78)	GP	Coalminers	CS	9
Wang ZG	1992	China	NA	9	OR	3.24 (1.69, 6.20)	Coalminers	Coalminers	CC	8

Abbreviation: CC: case control study; CM: coalminers with pneumoconiosis; CS: cohort study; DS: descriptive study; OPCS: Office of Population Censuses and Surveys; OR: odds ratio; PMR: proportional mortality ratio; RR: relative risk; SMR: standardized mortality ratio.