condition mean min max ZT0-3 162.502925 162.502925 162.502925 ZT4-7 200.9905665 200.9905665 200.9905665 ZT8-11 201.3313665 201.3313665 201.3313665 ZT12-15 231.86886650000002 231.86886650000002 231.86886650000002 ZT16-19 211.637124 211.637124 211.637124 ZT20-23 225.54853500000002 225.54853500000002 225.54853500000002