condition mean min max ZT0-3 27.0 27.0 27.0 ZT4-7 4.6 4.6 4.6 ZT8-11 39.65 39.65 39.65 ZT12-15 33.95 33.95 33.95 ZT16-19 11.25 11.25 11.25 ZT20-23 29.35 29.35 29.35