condition mean min max ZT0-3 6.550000000000001 6.550000000000001 6.550000000000001 ZT4-7 16.0 16.0 16.0 ZT8-11 5.1 5.1 5.1 ZT12-15 14.05 14.05 14.05 ZT16-19 10.5 10.5 10.5 ZT20-23 33.35 33.35 33.35