condition mean min max ZT0-3 7.9 7.9 7.9 ZT4-7 2.7 2.7 2.7 ZT8-11 5.199999999999999 5.199999999999999 5.199999999999999 ZT12-15 30.049999999999997 30.049999999999997 30.049999999999997 ZT16-19 7.2 7.2 7.2 ZT20-23 9.05 9.05 9.05