condition mean min max ZT0-3 8.812327499999999 8.352565 9.272089999999999 ZT4-7 10.22249 10.22249 10.22249 ZT8-11 12.3315 12.3315 12.3315 ZT12-15 0 0 0 ZT16-19 10.681149999999999 10.681149999999999 10.681149999999999 ZT20-23 12.1865 12.1865 12.1865