condition mean min max ZT0-3 36.2 36.2 36.2 ZT4-7 11.4 11.4 11.4 ZT8-11 17.95 17.95 17.95 ZT12-15 32.0 32.0 32.0 ZT16-19 38.75 38.75 38.75 ZT20-23 37.45 37.45 37.45