condition mean min max ZT0-3 7.126781333333334 5.154405000000001 9.61254 ZT4-7 3.85739835 3.85739835 3.85739835 ZT8-11 0.37134581 0.37134581 0.37134581 ZT12-15 1.70489475 0.5845644999999999 2.825225 ZT16-19 13.7229 13.7229 13.7229 ZT20-23 16.086550000000003 16.086550000000003 16.086550000000003