condition mean min max ZT0-3 61.0801 61.0801 61.0801 ZT4-7 32.5624 32.5624 32.5624 ZT8-11 33.29645 33.29645 33.29645 ZT12-15 35.3061 35.3061 35.3061 ZT16-19 67.46979999999999 67.46979999999999 67.46979999999999 ZT20-23 72.1793 72.1793 72.1793