condition mean min max ZT0-3 5.05 5.05 5.05 ZT4-7 2.2 2.2 2.2 ZT8-11 16.3 16.3 16.3 ZT12-15 12.65 12.65 12.65 ZT16-19 14.950000000000001 14.950000000000001 14.950000000000001 ZT20-23 2.05 2.05 2.05