condition mean min max ZT0-3 36.95 36.95 36.95 ZT4-7 32.1 32.1 32.1 ZT8-11 79.05000000000001 79.05000000000001 79.05000000000001 ZT12-15 49.75 49.75 49.75 ZT16-19 73.5 73.5 73.5 ZT20-23 57.25 57.25 57.25