It's a comparison of the ratings publications gave PM vs STDP. The first number's their PM score and the one in parentheses is their STDP score. (NEW) means the publication didn't review STDP.
All this leaves Musgraves a bit short of the revolutionary edict the press have foisted on her. Her music is as rooted in organic country and western traditions as ever, flush with cosmopolitan strings, instrumental banjo breaks, and generous portions of pedal steel, but the songwriting comes less organically, too often stretching itself thin over a genre that's historically benefited from a measure of simplicity.