condition mean min max ZT0-3 19.65 19.65 19.65 ZT4-7 4.0 4.0 4.0 ZT8-11 5.9 5.9 5.9 ZT12-15 39.55 39.55 39.55 ZT16-19 20.35 20.35 20.35 ZT20-23 26.55 26.55 26.55