condition mean min max ZT0-3 12.9564995005 8.239237640999999 17.67376136 ZT4-7 6.678700069 4.8781333515 8.4792667865 ZT8-11 21.26640472775 14.8729467155 27.65986274 ZT12-15 16.26923419575 12.1787738015 20.359694589999997 ZT16-19 9.54872926325 8.5161484415 10.581310085 ZT20-23 4.64450426425 3.6901679425 5.598840586