condition mean min max ZT0-3 517.1500000000001 517.1500000000001 517.1500000000001 ZT4-7 615.0 615.0 615.0 ZT8-11 612.65 612.65 612.65 ZT12-15 557.05 557.05 557.05 ZT16-19 557.9 557.9 557.9 ZT20-23 544.65 544.65 544.65