condition mean min max ZT0-3 34.25 34.25 34.25 ZT4-7 8.5 8.5 8.5 ZT8-11 30.3 30.3 30.3 ZT12-15 28.700000000000003 28.700000000000003 28.700000000000003 ZT16-19 78.1 78.1 78.1 ZT20-23 51.35 51.35 51.35