condition mean min max ZT0-3 31.92456319 28.37864226 35.47048412 ZT4-7 11.4713155485 11.375596277 11.56703482 ZT8-11 16.603227685 12.26716802 20.93928735 ZT12-15 27.6907460925 24.359360144999997 31.02213204 ZT16-19 27.407035985 24.77883894 30.03523303 ZT20-23 35.9363446225 33.81041753 38.062271714999994