condition mean min max ZT0-3 10.95 10.95 10.95 ZT4-7 5.4 5.4 5.4 ZT8-11 1.4 1.4 1.4 ZT12-15 3.1999999999999997 3.1999999999999997 3.1999999999999997 ZT16-19 15.65 15.65 15.65 ZT20-23 8.05 8.05 8.05