condition mean min max ZT0-3 23.75 23.75 23.75 ZT4-7 5.4 5.4 5.4 ZT8-11 10.5 10.5 10.5 ZT12-15 44.15 44.15 44.15 ZT16-19 65.05 65.05 65.05 ZT20-23 55.45 55.45 55.45