condition mean min max ZT0-3 5.45 5.45 5.45 ZT4-7 3.4 3.4 3.4 ZT8-11 10.35 10.35 10.35 ZT12-15 5.4 5.4 5.4 ZT16-19 5.0 5.0 5.0 ZT20-23 14.2 14.2 14.2