condition mean min max ZT0-3 0.22894786475 0.185809898 0.2720858315 ZT4-7 0.42366359724999997 0.3261400955 0.5211870989999999 ZT8-11 0.84162740475 0.7847432345 0.8985115749999999 ZT12-15 0.68909319975 0.571750836 0.8064355635 ZT16-19 0.53140406025 0.436605988 0.6262021325 ZT20-23 1.32465099825 1.3076768865 1.34162511