condition mean min max ZT0-3 5.449999999999999 5.449999999999999 5.449999999999999 ZT4-7 12.6 12.6 12.6 ZT8-11 4.1 4.1 4.1 ZT12-15 1.5499999999999998 1.5499999999999998 1.5499999999999998 ZT16-19 2.65 2.65 2.65 ZT20-23 14.1 14.1 14.1