condition mean min max ZT0-3 32.25 32.25 32.25 ZT4-7 8.2 8.2 8.2 ZT8-11 33.35 33.35 33.35 ZT12-15 18.6 18.6 18.6 ZT16-19 7.6 7.6 7.6 ZT20-23 29.0 29.0 29.0