Table 3.
Unadjusted odds ratio for neonicotinoid detections in public water supply wells.
| Odds Ratio |
95% CI | Z Statistic |
Chi-Square (p-value) |
|
|---|---|---|---|---|
| Alluvial vs Other Aquifer Types | 14.1 | 5.4 - 36.9 | 5.4 | < 0.0001 |
| High Vulnerability vs Low/intermediate Vulnerability | 17.2 | 6.0 - 49.3 | 5.3 | < 0.0001 |
| Unconfined vs confined wells | 15.1 | 6.0 - 38.2 | 5.7 | < 0.0001 |
| Confining thickness <=15 m vs >15 m 1 Detect or More | 13.5 | 4.8 – 38.4 | 4.9 | < 0.0001 |
| Confining thickness <=15 m vs >15 m 2 Detect or More | 75.8 | 4.4 – 1301.5 | 3.0 | 0.003 |
| Well depth <19.4 m vs Other Depth Quartiles with 1 or more detects | 19.4 | 6.5 - 57.9 | 5.3 | < 0.0001 |
| Well depth <19.4 m vs other depth quartiles with 2 or more detects | 35.0 | 9.4 – 129.9 | 5.3 | < 0.0001 |
| Northeast region vs other regions | 1.5 | 0.65 - 3.7 | 0.98 | 0.327 |
| Northwest region vs other regions | 2.5 | 0.92 - 7.0 | 1.8 | 0.073 |
| North Central region vs other regions | 0.22 | 0.06 - 0.8 | 2.3 | 0.021 |
| Southeast vs other regions | 0.21 | 0.05 - 0.99 | 2.0 | 0.048 |
| South Central vs other regions | 1.5 | 0.58 - 4.1 | 0.87 | 0.385 |
| Southwest vs other regions | 1.6 | 0.55 - 4.9 | 0.88 | 0.382 |
| Row crop dominant land use vs other types with at least one detect | 3.8 | 1.6 - 9.0 | 3.0 | 0.003 |
| Row crop & grassland/forest vs developed land use types with at least 1 detect | 3.6 | 1.6 - 8.1 | 3.2 | 0.002 |
| Row crop land use vs grassland/forest with at least one detect | 1.5 | 0.36 - 6.3 | 0.55 | 0.581 |
| Row crop land use vs developed with at least one detect | 4.3 | 1.75 - 10.4 | 3.2 | 0.001 |
| Row crop vs other land use for clothianidin detection | 4.5 | 1.88 - 10.8 | 3.4 | 0.001 |
| Grassland/Forest vs other land use for imidacloprid detection | 9.6 | 2.37 - 38.9 | 3.2 | 0.002 |
| Grassland/Forest vs other land use for thiamethoxam detection | 8.0 | 2.0 - 31.7 | 3.0 | 0.003 |
| Grassland/Forest vs row crop land use for imidacloprid detection | 9.0 | 1.6 - 50.3 | 2.5 | 0.012 |
| Grassland/Forest vs row crop land use for thiamethoxam detection | 4.0 | 0.87 - 18.4 | 1.8 | 0.076 |
| Row crop vs grassland/forest vs land use for clothianidin detection | 1.5 | 0.36 - 6.3 | 0.55 | 0.581 |
| Grassland/Forest vs other land use for two or more detections | 5.8 | 1.5 - 22.1 | 2.5 | 0.011 |
| Winter vs Summer CLO | 1.9 | 0.91 - 4.1 | 1.7 | 0.088 |
| Winter vs Summer IMI | 2.3 | 0.79 - 6.6 | 1.5 | 0.129 |
| Winter vs Summer THX | 2.0 | 0.76 - 5.3 | 1.4 | 0.157 |
| Winter vs Summer TD at least 1 detect | 1.9 | 0.91 – 4.2 | 1.7 | 0.087 |
| Winter vs Summer TD at least 2 or more detect | 3.2 | 1.2 – 8.8 | 2.3 | 0.022 |