condition mean min max ZT0-3 16.85 16.85 16.85 ZT4-7 21.6 21.6 21.6 ZT8-11 70.15 70.15 70.15 ZT12-15 54.15 54.15 54.15 ZT16-19 21.2 21.2 21.2 ZT20-23 22.2 22.2 22.2