if sex == "f":
            if age <= 49:
                hrv_adjusted["meanNN_Adjusted"] = (hrv["meanNN"]-901)/117
                hrv_adjusted["sdNN_Adjusted"] = (hrv["sdNN"]-44.9)/19.2
                hrv_adjusted["RMSSD_Adjusted"] = (hrv["RMSSD"]-36.5)/20.1