condition mean min max ZT0-3 4161.25 4161.25 4161.25 ZT4-7 4081.9 4081.9 4081.9 ZT8-11 3941.5499999999997 3941.5499999999997 3941.5499999999997 ZT12-15 3780.75 3780.75 3780.75 ZT16-19 3434.25 3434.25 3434.25 ZT20-23 3604.15 3604.15 3604.15