condition mean min max ZT0-3 220.83916666666667 215.62349999999998 224.2075 ZT4-7 159.8845 159.8845 159.8845 ZT8-11 108.79599999999999 108.79599999999999 108.79599999999999 ZT12-15 76.915225 75.19755 78.6329 ZT16-19 74.7893 74.7893 74.7893 ZT20-23 92.8142 92.8142 92.8142