condition mean min max ZT0-3 13.245633333333334 13.013300000000001 13.46845 ZT4-7 12.05185 12.05185 12.05185 ZT8-11 10.584755000000001 10.584755000000001 10.584755000000001 ZT12-15 13.633975000000001 13.593050000000002 13.674900000000001 ZT16-19 12.885950000000001 12.885950000000001 12.885950000000001 ZT20-23 15.95685 15.95685 15.95685