Economists cited heavy rain in October as a potential factor for the slide.
Another potential factor may be the pairing of fibre optic cable with a new electricity cable.
The presidential race is also a potential factor in the Senate contest.
Another potential factor is the Florida senator's little-known baptism into the Mormon church during his boyhood in Las Vegas.
Climate change, which increases the likelihood of extreme weather such as heavy rainfall that can flood the homes of animals, is also considered a potential factor.
Still, even doctors who are skeptical about the link are not willing to rule it out as a potential factor, possibly in connection with other heart defects.
Another potential factor linking the different outcomes to inequality is that black Americans are only half as likely as their white counterparts to have health insurance.
Only vowel environment seemed to be a potential factor.
It can be potential factor for food borne diseases.
Cliff Bleszinski: That could be a potential factor, but it's a very complicated formula.
The acentric factor was suggested as a potential factor to estimate the relative sorption rate.
