condition mean min max ZT0-3 32.25 32.25 32.25 ZT4-7 17.5 17.5 17.5 ZT8-11 40.1 40.1 40.1 ZT12-15 49.05 49.05 49.05 ZT16-19 25.25 25.25 25.25 ZT20-23 81.4 81.4 81.4