condition mean min max ZT0-3 171.675022 171.675022 171.675022 ZT4-7 210.3008915 210.3008915 210.3008915 ZT8-11 194.711992 194.711992 194.711992 ZT12-15 135.952919 135.952919 135.952919 ZT16-19 98.137516 98.137516 98.137516 ZT20-23 72.185783 72.185783 72.185783