condition mean min max ZT0-3 5.85 5.85 5.85 ZT4-7 27.7 27.7 27.7 ZT8-11 10.25 10.25 10.25 ZT12-15 34.25 34.25 34.25 ZT16-19 39.1 39.1 39.1 ZT20-23 4.65 4.65 4.65