condition mean min max ZT0-3 6.550000000000001 6.550000000000001 6.550000000000001 ZT4-7 21.3 21.3 21.3 ZT8-11 26.650000000000002 26.650000000000002 26.650000000000002 ZT12-15 24.55 24.55 24.55 ZT16-19 5.85 5.85 5.85 ZT20-23 33.55 33.55 33.55