condition mean min max ZT0-3 87.31540000000001 87.31540000000001 87.31540000000001 ZT4-7 89.8015 89.8015 89.8015 ZT8-11 81.52090000000001 81.52090000000001 81.52090000000001 ZT12-15 84.6636 84.6636 84.6636 ZT16-19 94.59790000000001 94.59790000000001 94.59790000000001 ZT20-23 86.84870000000001 86.84870000000001 86.84870000000001