condition mean min max ZT0-3 10.897245 10.897245 10.897245 ZT4-7 12.3268015 12.3268015 12.3268015 ZT8-11 12.098507999999999 12.098507999999999 12.098507999999999 ZT12-15 12.274120499999999 12.274120499999999 12.274120499999999 ZT16-19 12.254272 12.254272 12.254272 ZT20-23 11.901931000000001 11.901931000000001 11.901931000000001