condition mean min max ZT0-3 8.72981853175 4.870345498 12.5892915655 ZT4-7 17.6625276225 15.29779136 20.027263885 ZT8-11 21.74131812 19.421358615 24.061277625 ZT12-15 22.330806695 21.039777375 23.621836015 ZT16-19 24.59288944 22.503527464999998 26.682251415000003 ZT20-23 30.4006534525 28.590501869999997 32.210805035