condition mean min max ZT0-3 0.5252033333333334 0.358569 0.7016519999999999 ZT4-7 0.5826995 0.5826995 0.5826995 ZT8-11 1.0365165 1.0365165 1.0365165 ZT12-15 1.43464175 0.8778485 1.991435 ZT16-19 1.1526999999999998 1.1526999999999998 1.1526999999999998 ZT20-23 1.63279 1.63279 1.63279