condition mean min max ZT0-3 23.85 23.85 23.85 ZT4-7 4.6 4.6 4.6 ZT8-11 30.9 30.9 30.9 ZT12-15 57.45 57.45 57.45 ZT16-19 21.45 21.45 21.45 ZT20-23 10.05 10.05 10.05