condition mean min max ZT0-3 32.75 32.75 32.75 ZT4-7 61.7 61.7 61.7 ZT8-11 67.85 67.85 67.85 ZT12-15 67.55000000000001 67.55000000000001 67.55000000000001 ZT16-19 59.75 59.75 59.75 ZT20-23 74.25 74.25 74.25