condition mean min max ZT0-3 163.270101 163.270101 163.270101 ZT4-7 325.70079 325.70079 325.70079 ZT8-11 305.276785 305.276785 305.276785 ZT12-15 211.5874895 211.5874895 211.5874895 ZT16-19 155.20326999999997 155.20326999999997 155.20326999999997 ZT20-23 156.77071949999998 156.77071949999998 156.77071949999998