condition mean min max ZT0-3 0.8684287342500001 0.389291932 1.3475655365 ZT4-7 4.23674774975 2.495084721 5.9784107785 ZT8-11 13.86814879125 9.8396926875 17.896604895 ZT12-15 10.331554437 7.1004573285 13.5626515455 ZT16-19 3.37244361825 2.4897184475 4.255168789 ZT20-23 0.72059436 0.608343368 0.8328453519999999