condition mean min max ZT0-3 0.5604214425 0.40485325000000005 0.715989635 ZT4-7 1.48174085 1.385191388 1.578290312 ZT8-11 1.910250764 1.6175586343333332 2.2029428936666666 ZT12-15 1.4924985736666667 1.4750688873333333 1.5099282600000001 ZT16-19 1.039355697 1.021057759 1.057653635 ZT20-23 0.9467589025 0.9390641630000001 0.954453642