condition mean min max ZT0-3 19.856325 19.7196 19.99305 ZT4-7 26.663899999999998 26.663899999999998 26.663899999999998 ZT8-11 32.3896 32.3896 32.3896 ZT12-15 0 0 0 ZT16-19 30.176949999999998 30.176949999999998 30.176949999999998 ZT20-23 26.615299999999998 26.615299999999998 26.615299999999998