Our approach may have underestimated contributions from Asia, which increased Hg emissions approximately 70% between 1990 and 2000 (Pacyna et al. 2006) and is rapidly increasing its energy use, and overestimated contributions from NA and Europe due to decreased emissions.
Taking such things into consideration, he argued, rail still gave the American economy a boost, but of perhaps only a few percentage points of GDP.Economists have continued to study the question, and some estimates now suggest that Mr Fogel's method, which calculated the "social savings" of the railroad, underestimated the contribution of the railroad.
Therefore, it is reasonable to believe that this assumption has underestimated the contribution of water to GDP to a certain extent.
The study also revealed that most of the teachers underestimated the contribution that parents could provide in relation to identification and intervention programmes for their children with special educational needs.
However, different from what we observed in the ASW population, FIC and SIC underestimated ancestry contribution.
23 Most studies on type 2 diabetes offer only a one-off measurement of health behaviours, so previous studies may have underestimated their contribution.
Furthermore, it is possible that we underestimated the contribution of diet because our analysis did not fully capture effects arising from externally driven secular changes in dietary patterns.
This approach likely underestimated the contribution of G6PD deficiency in the genesis of hyperbilirubinemia as G6PD deficiency could certainly be co-expressed in the background of other triggers, such as mild prematurity or sepsis.
Thus, the results of our study may not generalize beyond this population of senior women and we may have underestimated the contribution of brain function to change in physiological falls risk.
Lung cancer GWA studies have successfully identified several novel susceptibility loci, 11– 13 but these studies may have severely underestimated the contribution of COPD and its underlying genetic determinants of lung cancer ("COPD-related" genes, Figure 1).
