condition mean min max ZT0-3 8.15076868325 6.9503995725 9.351137794 ZT4-7 9.42708189675 8.6664472275 10.187716565999999 ZT8-11 14.52662287 12.454818275000001 16.598427465 ZT12-15 13.5464914125 12.83802583 14.254956995 ZT16-19 17.759997865000003 15.443539560000001 20.07645617 ZT20-23 22.098052777499998 20.699410299999997 23.496695255