condition mean min max ZT0-3 10.819445 10.819445 10.819445 ZT4-7 10.236714 10.236714 10.236714 ZT8-11 11.4910365 11.4910365 11.4910365 ZT12-15 11.550186499999999 11.550186499999999 11.550186499999999 ZT16-19 10.157392999999999 10.157392999999999 10.157392999999999 ZT20-23 11.1176855 11.1176855 11.1176855