condition mean min max ZT0-3 30.4 30.4 30.4 ZT4-7 56.5 56.5 56.5 ZT8-11 78.15 78.15 78.15 ZT12-15 59.800000000000004 59.800000000000004 59.800000000000004 ZT16-19 56.65 56.65 56.65 ZT20-23 44.45 44.45 44.45