condition mean min max ZT0-3 553.7 553.7 553.7 ZT4-7 670.2 670.2 670.2 ZT8-11 512.75 512.75 512.75 ZT12-15 574.8 574.8 574.8 ZT16-19 558.1500000000001 558.1500000000001 558.1500000000001 ZT20-23 528.25 528.25 528.25