condition mean min max ZT0-3 63.3 63.3 63.3 ZT4-7 79.8 79.8 79.8 ZT8-11 63.0 63.0 63.0 ZT12-15 50.75 50.75 50.75 ZT16-19 63.449999999999996 63.449999999999996 63.449999999999996 ZT20-23 37.4 37.4 37.4