condition mean min max ZT0-3 57.9 57.9 57.9 ZT4-7 34.1 34.1 34.1 ZT8-11 47.25 47.25 47.25 ZT12-15 53.75 53.75 53.75 ZT16-19 26.7 26.7 26.7 ZT20-23 30.950000000000003 30.950000000000003 30.950000000000003