condition mean min max ZT0-3 0.5418998333333334 0.2477065 0.8284705 ZT4-7 0.161956 0.161956 0.161956 ZT8-11 1.3285900000000002 1.3285900000000002 1.3285900000000002 ZT12-15 3.2077649999999998 3.0768449999999996 3.338685 ZT16-19 2.451 2.451 2.451 ZT20-23 1.057985 1.057985 1.057985