No single allergen could be identified as responsible for the observed difference.

The concentrations of these metabolites could not be related to the observed difference in VFI.

However, the potential for selection bias and residual confounding factors may contribute to the observed difference.

The observed difference in the branch lengths of the two lineages may suggest differential evolutionary rates.

This suggests that relative involvement of affective processes may underlie our observed difference in intertemporal preferences.

However, the observed difference was only limited, leading to similar outcomes on most of the tested scores.

Epigenetic regulation might explain the observed difference in age of onset and magnitude of hearing impairment with age.

Both surfaces appear to be metallic; what, then, is the cause of the observed difference in their radiative power?

This analysis also showed that much of the observed difference in postoperative complication rates was attributable to other confounding factors.

This observed difference in phenotype is due to the two species having a unique combination of genetic, biological and evolutional properties.