condition mean min max ZT0-3 14.079766666666666 13.262699999999999 15.5705 ZT4-7 14.82545 14.82545 14.82545 ZT8-11 25.1123 25.1123 25.1123 ZT12-15 33.525475 22.5402 44.51075 ZT16-19 30.14555 30.14555 30.14555 ZT20-23 30.36405 30.36405 30.36405