condition mean min max ZT0-3 14.8 14.8 14.8 ZT4-7 7.1 7.1 7.1 ZT8-11 17.65 17.65 17.65 ZT12-15 26.25 26.25 26.25 ZT16-19 42.550000000000004 42.550000000000004 42.550000000000004 ZT20-23 47.449999999999996 47.449999999999996 47.449999999999996