condition mean min max ZT0-3 263.509801 263.509801 263.509801 ZT4-7 132.0860905 132.0860905 132.0860905 ZT8-11 90.239312 90.239312 90.239312 ZT12-15 108.202666 108.202666 108.202666 ZT16-19 135.07961899999998 135.07961899999998 135.07961899999998 ZT20-23 196.770819 196.770819 196.770819