condition mean min max ZT0-3 1.1307818333333333 0.5171604999999999 1.49059 ZT4-7 0.2438715 0.2438715 0.2438715 ZT8-11 0.866134 0.866134 0.866134 ZT12-15 0.91938275 0.627331 1.2114345 ZT16-19 0.769354 0.769354 0.769354 ZT20-23 1.93075 1.93075 1.93075