condition mean min max ZT0-3 38.736485 12.908055000000001 55.142399999999995 ZT4-7 12.60745 12.60745 12.60745 ZT8-11 12.986 12.986 12.986 ZT12-15 25.263775 16.142400000000002 34.385149999999996 ZT16-19 44.678 44.678 44.678 ZT20-23 51.615449999999996 51.615449999999996 51.615449999999996