condition mean min max ZT0-3 2.35 2.35 2.35 ZT4-7 2.7 2.7 2.7 ZT8-11 16.0 16.0 16.0 ZT12-15 2.45 2.45 2.45 ZT16-19 8.7 8.7 8.7 ZT20-23 13.4 13.4 13.4