condition mean min max ZT0-3 424.45000000000005 424.45000000000005 424.45000000000005 ZT4-7 619.5 619.5 619.5 ZT8-11 523.4 523.4 523.4 ZT12-15 432.85 432.85 432.85 ZT16-19 385.20000000000005 385.20000000000005 385.20000000000005 ZT20-23 352.29999999999995 352.29999999999995 352.29999999999995