condition mean min max ZT0-3 21.35 21.35 21.35 ZT4-7 76.0 76.0 76.0 ZT8-11 32.4 32.4 32.4 ZT12-15 17.05 17.05 17.05 ZT16-19 59.1 59.1 59.1 ZT20-23 28.4 28.4 28.4