In JMCQ's spring issue 10 years earlier, only six of 11 published studies included a colon. Ten years before that, six of 13 studies included the magic colon.
So is mass comm maturing as a field, as measured by colons in titles? I actually did a quick-and-fast-and-dirty and non-systematic study of colons and found that indeed their use has increased in our field. What that means I can't say, but one of these days I'm going to do a real analysis of colons in the major mass comm journals and submit the results to AEJMC, just for the hell of it and just to give some reviewer a reason to not accept a paper.
And just in case you think I'm making this crap up, here's an analysis of the so-called Dillion Hypothesis about colons in titles from studies published in the ecological sciences. As the abstract states:
In general, the results of this study support the Dillon Hypothesis of Titular Colonicity.