condition mean min max ZT0-3 84.094725 81.8074 86.38204999999999 ZT4-7 93.10485 93.10485 93.10485 ZT8-11 89.6576 89.6576 89.6576 ZT12-15 0 0 0 ZT16-19 78.8925 78.8925 78.8925 ZT20-23 82.8322 82.8322 82.8322