Diesel engine exhaust and lung cancer risks – evaluation of the meta-analysis by Vermeulen et al. 2014

Table 9 Linear regression with fixed effects for log RR with weighs proportional to the inverse of the respective variance, without adjustment for studies

log RR	Coef.	Std. Err.	t	P	95 % CI
Dose	0.00076	0.00026	2.97	0.018 (0.003)	0.00017 (0.00026	0.00135 0.00126)
Constant	0.130	0.072	1.80	0.11	−0.0365	0.297
Crump et al. [14], REC4
Dose	0.00033	0.00022	1.46	0.18 (0.15)	−0.00019 (−0.00011	0.00084 0.00076)
Constant	0.208	0.067	3.10	0.015	0.053	0.336
Crump et al. [14], REC6
Dose	0.00034	0.00020	1.74	0.12 (0.083)	−0.00011 (−0.00004	0.00080 0.00073)
Constant	0.211	0.054	3.90	0.005	0.860	0.335

Coefficient (Coef.) of the cumulative exposure (dose) to DEE in μg/m³-years and absolute term (Constant) with standard deviation (Std.Err.); t-test statistic for the coefficient with the corresponding P-value and a 95 % confidence interval for the coefficient, 95 % CI. The figures in parentheses are the results when using the standard normal distribution. Silverman et al. [4] was incorporated as used by Vermeulen et al. [1], and in accordance with the re-analysis by Crump et al. [14] with adjustment for radon exposure (REC4, REC6, cf. Table 3)

ISSN: 1745-6673