condition mean min max ZT0-3 22.15 22.15 22.15 ZT4-7 12.6 12.6 12.6 ZT8-11 38.55 38.55 38.55 ZT12-15 46.7 46.7 46.7 ZT16-19 31.4 31.4 31.4 ZT20-23 31.2 31.2 31.2