condition mean min max ZT0-3 0.3260183333333333 0.2308975 0.50503 ZT4-7 0.457062 0.457062 0.457062 ZT8-11 7.182995 7.182995 7.182995 ZT12-15 10.06969 4.037425 16.101955 ZT16-19 1.77027 1.77027 1.77027 ZT20-23 1.9607085 1.9607085 1.9607085