Table 7 Individual and meta‐analysis results for Group II cohort studies and case‐control studies of occupational TCE exposure and non‐Hodgkin's lymphoma.

Reference	Type of risk estimate	Risk estimate	95% CI
Group II cohort studies
Garabrant et al, 198845	SMR	0.80	0.68 to 0.95
Blair et al, 198942	SMR	1.06	0.34 to 2.47
Selden et al, 199146	SIR	0.93	0.19 to 2.73
Costa et al, 198941	SMR	0.80	0.41 to 1.40
Henschler et al, 199544	SMR	1.10	0.12 to 3.99
Chang et al, 200343 (men)	SMR	1.27	0.41 to 2.97
Chang et al, 200343 (women)	SMR	1.14	0.55 to 2.10
Summary risk estimate: random effects model	SRRE	0.84	0.73 to 0.98
Test for heterogeneity	p value	0.846
Case‐control studies
Greenland et al, 199431*	OR	0.76	0.24 to 2.42
Hardell et al, 199433	OR	7.20	1.30 to 42.0
Persson et al, 198934	OR	1.52	0.59 to 3.73
Siemiatycki et al, 199132†	OR	0.80	0.15 to 3.12
Summary risk estimate: random effects model	SRRE	1.39	0.62 to 3.10
Test for heterogeneity	p value	0.17
Summary risk estimate: excluding Hardell	SRRE	1.08	0.58 to 2.03
Test for heterogeneity	p value	0.58

*Results for ICD‐8 lymphomas 200–202.

†Substantial exposure group.