Pooling of data is recommended when sample sizes are limited in order to increase precision of estimates [ 14, 15].
The propensity score method has been used to reduce bias and increase precision of estimates in observational research [ 24- 26].
Using both factors further increases accuracy of estimates.
However, the association among women did not increase monotonically with increasing quartiles of estimated nitrate concentrations in their water supply exposure.
This analysis resulted in an increase of our estimate of pesticide deaths to 371,594 – an increase of around 110,000 deaths.
We conclude that shorter diaries would increase the quality of estimates and lower the costs of inquiry.
Extrapolating litter fall to a landscape scale with ANPP as a cross-correlate may increase the reliability of estimates.
Certainly, more experimental data are needed to increase the precision of estimates and predictions of AS ratios.
Sampling weights generally reduce bias but increase the variance of estimates.
The results are presented in stepwise tests of models with increasing numbers of estimated parameters, starting with empty models.
