condition mean min max ZT0-3 8.86981048225 8.283708595 9.4559123695 ZT4-7 10.53562602425 8.2653493585 12.80590269 ZT8-11 11.01292074925 10.98693893 11.0389025685 ZT12-15 8.795853596 8.7395091225 8.8521980695 ZT16-19 9.70393130125 7.9958781045 11.411984497999999 ZT20-23 19.278191247499997 17.306385794999997 21.2499967