condition mean min max ZT0-3 39.40665 34.093900000000005 44.7194 ZT4-7 28.433 28.433 28.433 ZT8-11 67.8762 67.8762 67.8762 ZT12-15 0 0 0 ZT16-19 89.0454 89.0454 89.0454 ZT20-23 72.20915 72.20915 72.20915