condition mean min max ZT0-3 5.55 5.55 5.55 ZT4-7 6.4 6.4 6.4 ZT8-11 3.45 3.45 3.45 ZT12-15 2.1 2.1 2.1 ZT16-19 2.2 2.2 2.2 ZT20-23 4.800000000000001 4.800000000000001 4.800000000000001