condition mean min max ZT0-3 52.25 52.25 52.25 ZT4-7 43.4 43.4 43.4 ZT8-11 23.6 23.6 23.6 ZT12-15 12.950000000000001 12.950000000000001 12.950000000000001 ZT16-19 50.800000000000004 50.800000000000004 50.800000000000004 ZT20-23 37.05 37.05 37.05