condition mean min max ZT0-3 19.906850000000002 11.437100000000001 27.15945 ZT4-7 14.88725 14.88725 14.88725 ZT8-11 13.35415 13.35415 13.35415 ZT12-15 26.469 25.836750000000002 27.10125 ZT16-19 24.28985 24.28985 24.28985 ZT20-23 27.3919 27.3919 27.3919