Allstate Corp.’s insurance premiums could be at “considerable risk” in 2012 if in fact agents are as unhappy as a new survey suggests and if their ranks have dropped as much as estimated, an analyst said Thursday.

On Wednesday, the National Association of Professional Allstate Agents Inc., which is often critical of the Northbrook-based home and auto insurer, released a study showing that nearly 73 percent of agents were “not very” or “not at all” satisfied with their relationship with the company.

Read more: The Chicago Tribune.