condition mean min max ZT0-3 5.25 5.25 5.25 ZT4-7 1.9 1.9 1.9 ZT8-11 5.65 5.65 5.65 ZT12-15 9.25 9.25 9.25 ZT16-19 5.55 5.55 5.55 ZT20-23 4.6000000000000005 4.6000000000000005 4.6000000000000005