condition mean min max ZT0-3 9.014686666666666 8.470875 9.646059999999999 ZT4-7 10.253145 10.253145 10.253145 ZT8-11 8.82622 8.82622 8.82622 ZT12-15 11.390025000000001 10.414200000000001 12.36585 ZT16-19 10.217355000000001 10.217355000000001 10.217355000000001 ZT20-23 10.92337 10.92337 10.92337