condition mean min max ZT0-3 4.6 4.6 4.6 ZT4-7 1.3 1.3 1.3 ZT8-11 2.5 2.5 2.5 ZT12-15 1.5 1.5 1.5 ZT16-19 11.4 11.4 11.4 ZT20-23 11.049999999999999 11.049999999999999 11.049999999999999