condition mean min max ZT0-3 652.35 652.35 652.35 ZT4-7 472.6 472.6 472.6 ZT8-11 316.15 316.15 316.15 ZT12-15 531.55 531.55 531.55 ZT16-19 591.6500000000001 591.6500000000001 591.6500000000001 ZT20-23 617.85 617.85 617.85