condition mean min max ZT0-3 40.35 40.35 40.35 ZT4-7 17.7 17.7 17.7 ZT8-11 27.65 27.65 27.65 ZT12-15 31.65 31.65 31.65 ZT16-19 58.35 58.35 58.35 ZT20-23 74.15 74.15 74.15