hmm… seems my reply just got lots in the internet? Apologies if this ends up being a re-post:
@anon-social: apparently not! They address the postdoc question directly twice. First here:
"Note that we did not include postdoctoral positions as a type of employment. Future research could examine the characteristics or determinants of why some individuals choose postdoctoral research employment compared with other types of employment and whether completing a postdoc helps applicants obtain other types of employment. As the current study did not explicitly assess whether the respondents were postdocs, it is possible that some post-docs responded affirmatively
to the question asking whether they were in a PhD program, and were thus included in the analysis. That said, post-docs are competing for the same jobs and thus are part of the same applicant pool for the employment positions investigated in this study."
also, footnote 4:
"4. Nonacademic employment could involve research-related activities, so the 12% increase should be interpreted within that context. Our survey of graduate students did not contain every possible employment option, such as nonacademic research positions, medical schools, law schools, postdocs, and so forth."
@anon: no problem. I read this and immediately thought it would be a goldmine for this site.