In their research, the French team tracked the sense of smell of 97 patients (67 women, 30 men) averaging about 39 years of age. ... By the four-month mark, objective testing of 51 of the patients showed that about 84% (43) had already regained a sense of smell … Overall, 96% of the patients objectively recovered by 12 months, Renaud's team reported. The study was published online June 24 in JAMA Network Open.