condition mean min max ZT0-3 8.34991 8.34991 8.34991 ZT4-7 10.0449615 10.0449615 10.0449615 ZT8-11 11.1832675 11.1832675 11.1832675 ZT12-15 10.218146 10.218146 10.218146 ZT16-19 9.916331 9.916331 9.916331 ZT20-23 10.507688 10.507688 10.507688