condition mean min max ZT0-3 20.45 20.45 20.45 ZT4-7 8.8 8.8 8.8 ZT8-11 4.7 4.7 4.7 ZT12-15 8.75 8.75 8.75 ZT16-19 12.15 12.15 12.15 ZT20-23 38.550000000000004 38.550000000000004 38.550000000000004