Populations (n), metarisk estimates (MRRs) (95% CIs), ranges of point estimates and p values for heterogeneity by occupational agents (proportional studies excluded: simple random effects models with no covariates)
| Agent | n | MRR | 95% CI | Range of point estimate | p Value |
| Aliphatic and alicyclic hydrocarbon solvents | 2 | 1.3 | 0.8 to 2.0 | 1.0–1.6 | 0.09 |
| Aromatic hydrocarbon solvents | 13 | 1.0 | 0.8 to 1.3 | 0.5–2.9 | 0.2 |
| Arsenic | 4 | 1.0 | 0.6 to 1.6 | 0.9–1.4 | 0.9 |
| Asbestos | 24 | 1.1 | 0.9 to 1.4 | 0.5–3.6 | 0.004 |
| Cadmium and cadmium compounds | 2 | 0.7 | 0.4 to 1.4 | 0.7–0.8 | 0.9 |
| Chlorinated hydrocarbon solvents and related compounds | 20 | 1.4 | 1.0 to 1.8 | 0.3–4.9 | 0.05 |
| Chromium and chromium compounds | 9 | 1.4 | 0.9 to 2.3 | 0.6–20 | 0.2 |
| Diesel engine exhaust | 7 | 1.0 | 0.9 to 1.2 | 0.5–1.4 | 0.2 |
| Electromagnetic fields | 5 | 1.1 | 0.8 to 1.4 | 0.6–2.4 | 0.04 |
| Flour dust | 1 | 1.1 | 0.3 to 3.2 | ||
| Formaldehyde | 5 | 0.8 | 0.5 to 1.0 | 0.5–1.0 | 0.3 |
| Fungicides | 2 | 1.3 | 0.4 to 3.8 | 1.3–1.4 | 0.9 |
| Gasoline | 4 | 1.0 | 0.8 to 1.2 | 0.2–1.1 | 0.5 |
| Herbicides | 10 | 1.0 | 0.8 to 1.3 | 0.6–5.9 | 0.3 |
| Insecticides | 3 | 1.5 | 0.6 to 3.7 | 0.8–21.0 | 0.1 |
| Iron and iron compounds | 1 | 1.3 | 0.7 to 2.5 | ||
| Lead and lead compounds | 4 | 1.1 | 0.8 to 1.5 | 1.0–1.4 | 1.0 |
| Man made vitreous fibres | 5 | 1.0 | 0.6 to 1.6 | 0.3–6.8 | 0.03 |
| Nickel and nickel compounds | 4 | 1.9 | 1.2 to 3.2 | 1.2–3.6 | 0.9 |
| Oil mist | 6 | 0.9 | 0.8 to 1.0 | 0.3–1.0 | 0.5 |
| Polycyclic aromatic hydrocarbons (PAHs) | 4 | 1.5 | 0.9 to 2.5 | 1.3–3.6 | 0.8 |
| Silica dust | 3 | 1.4 | 0.9 to 2.0 | 1.1–2.0 | 0.2 |
| Wood dust | 4 | 1.1 | 0.8 to 1.5 | 0.7–1.7 | 0.3 |