condition mean min max ZT0-3 0.018488921749999998 0.0 0.036977843499999996 ZT4-7 0.06582557674999999 0.011830259 0.11982089449999998 ZT8-11 0.7173160034999999 0.36136121749999994 1.0732707895 ZT12-15 1.796407393 1.5989025590000001 1.993912227 ZT16-19 1.7510857932500001 1.7135421535 1.788629433 ZT20-23 1.99881904125 1.8712060365 2.126432046