condition mean min max ZT0-3 761.005955 761.005955 761.005955 ZT4-7 610.916594 610.916594 610.916594 ZT8-11 757.9319025 757.9319025 757.9319025 ZT12-15 852.3691335 852.3691335 852.3691335 ZT16-19 1056.1357025 1056.1357025 1056.1357025 ZT20-23 1011.3859030000001 1011.3859030000001 1011.3859030000001