condition mean min max ZT0-3 50.15 50.15 50.15 ZT4-7 17.3 17.3 17.3 ZT8-11 22.7 22.7 22.7 ZT12-15 26.35 26.35 26.35 ZT16-19 27.8 27.8 27.8 ZT20-23 43.3 43.3 43.3