condition mean min max ZT0-3 206.001288 206.001288 206.001288 ZT4-7 195.61454750000001 195.61454750000001 195.61454750000001 ZT8-11 159.55623500000002 159.55623500000002 159.55623500000002 ZT12-15 125.853837 125.853837 125.853837 ZT16-19 101.60862850000001 101.60862850000001 101.60862850000001 ZT20-23 102.2284525 102.2284525 102.2284525