condition mean min max ZT0-3 301.155134 301.155134 301.155134 ZT4-7 313.6610455 313.6610455 313.6610455 ZT8-11 305.2706795 305.2706795 305.2706795 ZT12-15 335.330146 335.330146 335.330146 ZT16-19 261.318828 261.318828 261.318828 ZT20-23 304.757509 304.757509 304.757509