condition mean min max ZT0-3 51.65 51.65 51.65 ZT4-7 36.3 36.3 36.3 ZT8-11 39.449999999999996 39.449999999999996 39.449999999999996 ZT12-15 90.8 90.8 90.8 ZT16-19 89.94999999999999 89.94999999999999 89.94999999999999 ZT20-23 49.9 49.9 49.9