condition mean min max ZT0-3 91.925925 90.35825 93.4936 ZT4-7 70.7156 70.7156 70.7156 ZT8-11 101.9025 101.9025 101.9025 ZT12-15 0 0 0 ZT16-19 97.5035 97.5035 97.5035 ZT20-23 77.60715 77.60715 77.60715