condition mean min max ZT0-3 66.833625 48.331149999999994 85.3361 ZT4-7 87.7697 87.7697 87.7697 ZT8-11 13.6599 13.6599 13.6599 ZT12-15 0 0 0 ZT16-19 1.109115 1.109115 1.109115 ZT20-23 17.0546 17.0546 17.0546