Table 5 |
|||||||
|
Comparison of individual and overall (random-effects) estimates for the two reviews – lung cancer |
|||||||
|
ST usea |
|||||||
|
|
|||||||
|
Ref |
Type |
Exposure |
Inclusion of smokersb |
Reviewc |
Sex |
Relative risk (95% CI) |
Comments |
|
|
|||||||
|
[31] |
ST |
Ever |
NS |
L&H |
F |
6.80 (1.60–28.5) |
Not included by B |
|
[3] |
ST |
Current |
NS |
L&H |
M |
1.08 (0.64–1.83) |
|
|
(CPS-I) |
ST |
Current |
NS |
B |
M |
1.1 (0.6–1.8) |
Estimates agreed |
|
[3] |
ST |
Ever |
NS |
L&H |
M |
1.77 (1.14–2.74)e |
|
|
(CPS-II) |
ST |
Current |
NS |
B |
M |
2.0 (1.2–3.2) |
Current not ever exposure |
|
[4] |
Snuff |
Ever |
SNS |
L&H |
M |
0.80 (0.61–1.05) |
Estimate for NS also available |
|
Snuff |
Ever |
SNS |
B |
M |
0.8 (0.6–1.1) |
Estimates agreed |
|
|
[5] |
Snuff |
Ever |
SNS |
L&H |
M |
0.7 (0.6–0.7) |
|
|
Snuff |
Ever |
NS |
B |
M |
0.8 (0.5–1.3) |
NS not SNS |
|
|
[27] |
ST |
Ever |
SNS |
L&H |
M |
0.69 (0.47–1.00)e |
Not included by B |
|
Total |
L&H |
0.99 (0.71–1.37) |
6 estimates |
||||
|
B |
1.2 (0.7–1.9) |
5 estimatesf |
|||||
|
|
|||||||
|
a ST = smokeless tobacco; ever exposure includes undefined use. b NS = never smokers; SNS = smokers and nonsmokers combined (with adjustment for smoking). c L&H = Lee and Hamling review [2]; B = Boffetta et al. review [1]. d To within rounding error, as B only expressed estimates to one decimal place. e Estimated from data provided. f B only presented four estimates, but a combined result stated to be based on five. The random-effects estimate for the four estimates provided is 1.1 (0.7–1.6) |
|||||||
|
Lee and Hamling BMC Cancer 2009 9:256 doi:10.1186/1471-2407-9-256 |
|||||||
