condition mean min max ZT0-3 10.4272 10.4272 10.4272 ZT4-7 1.55404 1.55404 1.55404 ZT8-11 2.006705 2.006705 2.006705 ZT12-15 18.32815 18.32815 18.32815 ZT16-19 59.476200000000006 59.476200000000006 59.476200000000006 ZT20-23 38.51105 38.51105 38.51105