condition mean min max ZT0-3 4.86034 4.86034 4.86034 ZT4-7 3.064705 3.064705 3.064705 ZT8-11 4.94808 4.94808 4.94808 ZT12-15 4.78986 4.78986 4.78986 ZT16-19 6.0286550000000005 6.0286550000000005 6.0286550000000005 ZT20-23 3.9971550000000002 3.9971550000000002 3.9971550000000002