condition mean min max ZT0-3 0.070339717 0.0 0.140679434 ZT4-7 1.39784660025 0.4512535145 2.3444396860000003 ZT8-11 4.13429140725 3.505798444 4.7627843705 ZT12-15 4.74136851075 4.23719713 5.2455398915 ZT16-19 4.4415344160000005 3.9597528325 4.923315999500001 ZT20-23 10.976955666250001 7.775648972500001 14.178262360000002