condition mean min max ZT0-3 22.914115 22.914115 22.914115 ZT4-7 16.6000975 16.6000975 16.6000975 ZT8-11 13.226215499999999 13.226215499999999 13.226215499999999 ZT12-15 18.899764 18.899764 18.899764 ZT16-19 12.324237 12.324237 12.324237 ZT20-23 10.7047415 10.7047415 10.7047415