condition mean min max ZT0-3 7.4757 1.668725 12.1746 ZT4-7 4.95821 4.95821 4.95821 ZT8-11 3.4340599999999997 3.4340599999999997 3.4340599999999997 ZT12-15 8.995000000000001 5.5936 12.3964 ZT16-19 9.78777 9.78777 9.78777 ZT20-23 10.974505 10.974505 10.974505