Table 3 Comparison of individual and overall (random-effects) estimates for the two reviews – oesophageal cancer
| Â | ST usea | Â | Â | Â | Â | Â | |
|---|---|---|---|---|---|---|---|
Ref | Type | Exposure | Inclusion of smokersb | Reviewc | Sex | Relative risk (95% CI) | Comments |
[4] | Snuff | Ever | SNS | L&H | M | 1.40 (0.61–3.24) |  |
|  | Snuff | Ever | SNS | B | M | 1.4 (0.6–3.2) | Estimates agreed |
[22] | Snuff | Ever | SNS | L&H | M | 1.00 (0.79–1.27)e | Estimate for NS also available |
|  | Snuff | Ever | NS | B | M | 3.5 (1.6–7.6) | NS not SNS; squamous cell carcinoma not all oesophageal cancer |
[23] | Chew | Ever | NS | L&H | M | 1.18 (0.28–4.90)e | Not included by B |
|  | Chew | Ever | NS | L&H | F | 2.69 (0.92–7.87)e | Not included by B |
[24] | ST | Ever | NS | L&H | M | 1.2 (0.1–13.3) |  |
|  | ST | Ever | NS | B | M | 1.2 (0.1–13.3) | Estimates agree |
[18] | Snuff | Ever | SNS | L&H | M | 1.2 (0.7–2.2) |  |
|  | Snuff | Ever | SNS | B | M | 1.2 (0.7–2.2) | Estimates agree |
[25] | Snuff | Ever | SNS | L&H | M+F | 1.31 (0.89–1.92)e |  |
|  | Snuff | Ever | SNS | B | M+F | 1.4 (0.9–2.3) | Squamous cell carcinoma not all oesophageal cancer |
Total |  |  |  | L&H |  | 1.13 (0.95–1.36) | 7 estimates |
|  |  |  |  | B |  | 1.6 (1.1–2.3) | 5 estimates |