condition mean min max ZT0-3 5.284235 4.46667 6.1018 ZT4-7 15.22775 15.22775 15.22775 ZT8-11 6.89429 6.89429 6.89429 ZT12-15 0 0 0 ZT16-19 5.244895 5.244895 5.244895 ZT20-23 4.534745 4.534745 4.534745