condition mean min max ZT0-3 21.6920185075 14.732150815 28.651886199999996 ZT4-7 10.43012224675 8.4167778035 12.443466690000001 ZT8-11 15.972502372500001 13.184180215000001 18.76082453 ZT12-15 15.563098835 14.20298962 16.92320805 ZT16-19 15.24366199 14.659453029999998 15.82787095 ZT20-23 18.5531963425 17.814461805 19.291930880000002