condition mean min max ZT0-3 43.8 43.8 43.8 ZT4-7 47.5 47.5 47.5 ZT8-11 28.099999999999998 28.099999999999998 28.099999999999998 ZT12-15 49.4 49.4 49.4 ZT16-19 53.650000000000006 53.650000000000006 53.650000000000006 ZT20-23 39.449999999999996 39.449999999999996 39.449999999999996