condition mean min max ZT0-3 59.7 59.7 59.7 ZT4-7 26.7 26.7 26.7 ZT8-11 23.2 23.2 23.2 ZT12-15 58.25 58.25 58.25 ZT16-19 53.15 53.15 53.15 ZT20-23 33.9 33.9 33.9