condition mean min max ZT0-3 4.55 4.55 4.55 ZT4-7 4.0 4.0 4.0 ZT8-11 23.0 23.0 23.0 ZT12-15 26.05 26.05 26.05 ZT16-19 17.7 17.7 17.7 ZT20-23 31.45 31.45 31.45