condition mean min max ZT0-3 28.550874999999998 27.3949 29.70685 ZT4-7 33.2211 33.2211 33.2211 ZT8-11 25.981450000000002 25.981450000000002 25.981450000000002 ZT12-15 0 0 0 ZT16-19 43.79865 43.79865 43.79865 ZT20-23 58.6015 58.6015 58.6015