condition mean min max ZT0-3 29.25 29.25 29.25 ZT4-7 12.1 12.1 12.1 ZT8-11 13.05 13.05 13.05 ZT12-15 51.55 51.55 51.55 ZT16-19 34.55 34.55 34.55 ZT20-23 27.45 27.45 27.45