condition mean min max ZT0-3 12.8 12.8 12.8 ZT4-7 23.3 23.3 23.3 ZT8-11 5.5 5.5 5.5 ZT12-15 15.45 15.45 15.45 ZT16-19 6.2 6.2 6.2 ZT20-23 28.700000000000003 28.700000000000003 28.700000000000003