condition mean min max ZT0-3 19.45 19.45 19.45 ZT4-7 21.2 21.2 21.2 ZT8-11 12.3 12.3 12.3 ZT12-15 32.65 32.65 32.65 ZT16-19 33.2 33.2 33.2 ZT20-23 25.700000000000003 25.700000000000003 25.700000000000003