According to research published in 2013, what proportion of the u. s. adult population reports being afraid to walk alone at night in their own communities

The answer is "one-third or 1/3".

We found that around 1/3 of grown-ups announced being hesitant to walk alone in their own communities. As earlier research has shown, ladies were essentially more prone to report fear than men (44% contrasted with 19%). So also, sexual minorities and individuals of were essentially more probable than heteros and non-Hispanic whites, separately, to report being hesitant to walk alone during the night.