condition mean min max ZT0-3 2.35 2.35 2.35 ZT4-7 6.8 6.8 6.8 ZT8-11 16.25 16.25 16.25 ZT12-15 9.3 9.3 9.3 ZT16-19 16.45 16.45 16.45 ZT20-23 11.65 11.65 11.65