Table 4. The effect of urbanization on the relationships between glyphosate use and ADHD hospital discharges, using two ways fixed effects within model in R and adjusting for heteroskedasticity and serial correlation and including all significant covariates that passed screening in Model 1.
| Glyphosate use (2006–2009) and ADHD discharges (2007–2010) | ||||
|---|---|---|---|---|
| Category | r 2 | Estimate | Standard Error | |
| Metropolitan (k = 1) | 88 | 0.01 | -1.92e-06 | 4.00e-06 |
| Fringe Metro (k = 2) | 104 | 0.02 | -6.94e-07 | 2.52e-06 |
| Urban (k = 3) | 123 | 0.08 | 2.40e-06 | 9.95e-07 § |
| Rural (k = 4) | 111 | 0.12 | -4.17e-06 | 2.40e-06 |
§ corrected p < .025