condition mean min max ZT0-3 5.45 5.45 5.45 ZT4-7 5.5 5.5 5.5 ZT8-11 16.0 16.0 16.0 ZT12-15 27.55 27.55 27.55 ZT16-19 15.2 15.2 15.2 ZT20-23 7.0 7.0 7.0