condition mean min max ZT0-3 20.55 20.55 20.55 ZT4-7 38.1 38.1 38.1 ZT8-11 32.9 32.9 32.9 ZT12-15 43.75 43.75 43.75 ZT16-19 21.3 21.3 21.3 ZT20-23 37.55 37.55 37.55