condition mean min max ZT0-3 0.26575611666666665 0.207793 0.34250800000000003 ZT4-7 0.0 0.0 0.0 ZT8-11 0.20566800000000002 0.20566800000000002 0.20566800000000002 ZT12-15 0.14057875 0.075871 0.2052865 ZT16-19 0.32424949999999997 0.32424949999999997 0.32424949999999997 ZT20-23 0.108143 0.108143 0.108143