I recently performed a statistical analysis of project management salaries in the US. This analysis applies to publically listed full-time project management roles in January 2010.
The average salary for a project manager was $89,442, but more interesting was what drove the differences. Having a PMP certification was not statistically significant, nor were industry or sector differences. The two things that mattered were level of experience and the managerial rank of the position (whether it was for an individual contributor, a manager or a manager of managers). The implication is that general management skill is more relevant than project management skill in determining salary. The other point to note is that not all “experience” is created equal from a job application perspective, most positions listing experience wanted specific industry expertise, whether with specific software, power generation systems or government contracting methods. Again, these skills were not specific to the discipline of project management per se, but instead specific to the industry in which the project manager operates.