condition mean min max ZT0-3 213.155134 213.155134 213.155134 ZT4-7 187.4889335 187.4889335 187.4889335 ZT8-11 267.3538065 267.3538065 267.3538065 ZT12-15 372.1050665 372.1050665 372.1050665 ZT16-19 207.482003 207.482003 207.482003 ZT20-23 228.1838125 228.1838125 228.1838125