condition mean min max ZT0-3 20.0303 20.0303 20.0303 ZT4-7 18.038800000000002 18.038800000000002 18.038800000000002 ZT8-11 18.80525 18.80525 18.80525 ZT12-15 17.54955 17.54955 17.54955 ZT16-19 21.9521 21.9521 21.9521 ZT20-23 19.66305 19.66305 19.66305