condition mean min max ZT0-3 63.449999999999996 63.449999999999996 63.449999999999996 ZT4-7 71.1 71.1 71.1 ZT8-11 79.25 79.25 79.25 ZT12-15 47.1 47.1 47.1 ZT16-19 57.6 57.6 57.6 ZT20-23 58.2 58.2 58.2