condition mean min max ZT0-3 7.45 7.45 7.45 ZT4-7 17.5 17.5 17.5 ZT8-11 27.1 27.1 27.1 ZT12-15 12.7 12.7 12.7 ZT16-19 8.05 8.05 8.05 ZT20-23 15.0 15.0 15.0