condition mean min max ZT0-3 2.0370399999999997 2.0370399999999997 2.0370399999999997 ZT4-7 3.25143 3.25143 3.25143 ZT8-11 2.10975 2.10975 2.10975 ZT12-15 1.3805049999999999 1.3805049999999999 1.3805049999999999 ZT16-19 1.8938449999999998 1.8938449999999998 1.8938449999999998 ZT20-23 1.501465 1.501465 1.501465