condition mean min max ZT0-3 14.152341666666667 10.544325 17.488799999999998 ZT4-7 4.989865 4.989865 4.989865 ZT8-11 16.200899999999997 16.200899999999997 16.200899999999997 ZT12-15 35.067274999999995 30.977449999999997 39.1571 ZT16-19 41.2449 41.2449 41.2449 ZT20-23 45.352199999999996 45.352199999999996 45.352199999999996