The researchers hoped to measure the relationship between rainfall, temperature and birth weight. They found that that lower levels of rainfall and an increased number of very hot days during pregnancy appears to raise the risk of lower birth weight. Low birth excess weight occurs whenever a baby is born weighing less than 2,500 grams , the researchers said. Although this study was able to find a link between rainfall and temperature and the amount of babies with low birth weights, it wasn’t designed to prove a cause-and-effect relationship between these factors. Still, the experts expressed concern. ‘Our findings demonstrate that in the very early stages of intrauterine development, climate change has the potential to significantly impact birth outcomes.Second, all of the patients in our study received treatment because of their COPD, that was managed by their normal physicians. Although non-e of the drugs available for the treating COPD have already been shown unequivocally to reduce the decline in FEV1,3 a secondary evaluation in the TORCH research indicated that declines in FEV1 may be decreased with regular treatment,15 and similar indications were evident in subgroup analyses in the UPLIFT trial.16 Our research was purely observational, and we chose not to include treatment inside our analyses, since the ramifications of treatment on the rate of decline in FEV1 are likely to be confounded due to bias by indication and other biases that are characteristic of observational pharmacoepidemiologic research.