condition mean min max ZT0-3 21.3 21.3 21.3 ZT4-7 34.3 34.3 34.3 ZT8-11 24.15 24.15 24.15 ZT12-15 26.7 26.7 26.7 ZT16-19 58.25 58.25 58.25 ZT20-23 54.05 54.05 54.05