condition mean min max ZT0-3 5.7295549999999995 5.7295549999999995 5.7295549999999995 ZT4-7 3.5011799999999997 3.5011799999999997 3.5011799999999997 ZT8-11 4.346135 4.346135 4.346135 ZT12-15 4.8141300000000005 4.8141300000000005 4.8141300000000005 ZT16-19 6.50361 6.50361 6.50361 ZT20-23 6.41408 6.41408 6.41408