condition mean min max ZT0-3 54.7 54.7 54.7 ZT4-7 58.7 58.7 58.7 ZT8-11 56.8 56.8 56.8 ZT12-15 41.15 41.15 41.15 ZT16-19 55.7 55.7 55.7 ZT20-23 71.05 71.05 71.05