Relative risk and 95% confidence interval (CI) by quartile of brain cancer incidence by proportion of municipal land surface area devoted to different uses in Navarre and the Basque Country: both sexes, 1986–93
| Land surface use | Q2 (95% CI) | Q3 (95% CI) | Q4 (95% CI) | Trend p value* |
|---|---|---|---|---|
| The reference category is the 1st quartile. | ||||
| *Tests for trend were calculated assigning an increasing integer to each quartile using the Poisson regression model. | ||||
| NS, not statistically significant. | ||||
| Urban | 1.17 (0.91 to 1.52) | 1.27 (1.04 to 1.55) | 1.23 (1.02 to 1.47) | NS |
| Industrial | 0.97 (0.81 to 1.15) | 1.10 (0.97 to 1.25) | 0.92 (0.79 to 1.06) | NS |
| Road and rail networks, port areas | 1.12 (0.98 to 1.29) | 1.24 (1.03 to 1.49) | 0.99 (0.88 to 1.12) | NS |
| Mines and quarries | 1.17 (0.99 to 1.37) | 0.94 (0.81 to 1.08) | 1.02 (0.69 to 1.50) | NS |
| Non-irrigated arable land | 0.82 (0.58 to 1.16) | 1.29 (1.11 to 1.49) | 1.23 (1.05 to 1.43) | 0.0002 |
| Permanently irrigated land | 1.16 (0.79 to 1.71) | 1.31 (1.13 to 1.52) | 0.92 (0.66 to 1.26) | 0.013 |
| Vineyards | 1.05 (0.55 to 2.03) | 1.60 (0.76 to 3.36) | 0.57 (0.14 to 2.28) | NS |
| Non-irrigated orchards | 0.53 (0.27 to 1.06) | 1.12 (0.36 to 3.48) | 0.07 – | NS |
| Permanently irrigated orchards | 0.92 (0.80 to 1.06) | 1.10 (0.93 to 1.31) | 1.10 (0.30 to 4.82) | NS |
| Meadowland | 0.89 (0.76 to 1.04) | 1.04 (0.88 to 1.23) | 0.87 (0.77 to 0.98) | 0.046 |
| Complex cultivation patterns | 0.87 (0.75 to 1.00) | 0.83 (0.71 to 0.96) | 0.86 (0.71 to 1.03) | NS |
| Evergreen forest | 0.90 (0.80 to 1.01) | 1.09 (0.94 to 1.27) | 1.07 (0.87 to 1.32) | NS |
| Deciduous forest | 0.84 (0.73 to 0.96) | 0.96 (0.86 to 1.09) | 0.91 (0.69 to 1.20) | NS |
| Coniferous forest | 1.29 (1.08 to 1.54) | 1.11 (0.93 to 1.32) | 1.08 (0.90 to 1.30) | NS |
| Mixed forest | 1.06 (0.92 to 1.22) | 0.94 (0.82 to 1.06) | 0.80 (0.68 to 0.93) | 0.004 |
| Pasture | 0.95 (0.83 to 1.09) | 1.10 (0.82 to 1.49) | 1.03 (0.74 to 1.45) | NS |
| Sclerophyllous vegetation | 1.33 (1.12 to 1.58) | 1.09 (0.93 to 1.27) | 0.98 (0.79 to 1.20) | NS |
| Beaches, dunes, deserts | 0.96 (0.86 to 1.08) | 1.09 (0.88 to 1.34) | 1.01 (0.84 to 1.22) | NS |
| Wetlands | 0.93 (0.82 to 1.06) | 0.84 (0.54 to 1.30) | 0.94 (0.68 to 1.31) | NS |
| Coastal areas | 0.88 (0.77 to 1.00) | 0.95 (0.76 to 1.18) | 0.85 (0.69 to 1.06) | NS |