condition mean min max ZT0-3 3.0717345949999997 1.840307308 4.3031618819999995 ZT4-7 0.54309346925 0.3266673295 0.7595196089999999 ZT8-11 0.06111186775 0.033387743 0.0888359925 ZT12-15 9.41130235275 6.282774399 12.5398303065 ZT16-19 12.416852784500001 10.035716079 14.79798949 ZT20-23 13.222236329000001 12.000546031 14.443926627