condition mean min max ZT0-3 38.5 38.5 38.5 ZT4-7 18.1 18.1 18.1 ZT8-11 15.45 15.45 15.45 ZT12-15 58.75 58.75 58.75 ZT16-19 20.6 20.6 20.6 ZT20-23 18.9 18.9 18.9