condition mean min max ZT0-3 48.555975000000004 42.7213 54.39065 ZT4-7 35.55555 35.55555 35.55555 ZT8-11 32.8135 32.8135 32.8135 ZT12-15 0 0 0 ZT16-19 42.7753 42.7753 42.7753 ZT20-23 48.29825 48.29825 48.29825