In 1985 Perelli, Pintz & Salerno proved a short-interval form of the Bombieri-Vinogradov theorem with $\theta \in (3/5, 1]$. Have there been any improvements on this, in particular with the reduction of the lower bound on $\theta$?

I'm not fussed if some of the other variables are changed as, clearly, $\psi$ would have to be altered if we could get $\theta < 1/2$, but I just need a good $\theta$ whilst keeping (roughly) the same R.H.S..