condition mean min max ZT0-3 928.0 928.0 928.0 ZT4-7 546.1 546.1 546.1 ZT8-11 468.35 468.35 468.35 ZT12-15 606.9000000000001 606.9000000000001 606.9000000000001 ZT16-19 744.6 744.6 744.6 ZT20-23 872.05 872.05 872.05