condition mean min max ZT0-3 10.053981 10.053981 10.053981 ZT4-7 9.8838005 9.8838005 9.8838005 ZT8-11 9.3558105 9.3558105 9.3558105 ZT12-15 10.256766500000001 10.256766500000001 10.256766500000001 ZT16-19 10.0520665 10.0520665 10.0520665 ZT20-23 10.183008000000001 10.183008000000001 10.183008000000001