condition mean min max ZT0-3 4.5124425 4.41254 4.6123449999999995 ZT4-7 5.00314 5.00314 5.00314 ZT8-11 8.308575000000001 8.308575000000001 8.308575000000001 ZT12-15 0 0 0 ZT16-19 7.516629999999999 7.516629999999999 7.516629999999999 ZT20-23 4.716005 4.716005 4.716005