condition mean min max ZT0-3 24.45 24.45 24.45 ZT4-7 6.9 6.9 6.9 ZT8-11 15.35 15.35 15.35 ZT12-15 58.2 58.2 58.2 ZT16-19 40.8 40.8 40.8 ZT20-23 40.4 40.4 40.4