condition mean min max ZT0-3 27.9424 27.9424 27.9424 ZT4-7 13.9075 13.9075 13.9075 ZT8-11 15.74175 15.74175 15.74175 ZT12-15 17.562150000000003 17.562150000000003 17.562150000000003 ZT16-19 29.02785 29.02785 29.02785 ZT20-23 30.638849999999998 30.638849999999998 30.638849999999998