condition mean min max ZT0-3 0.3252994125 0.317437358 0.333161467 ZT4-7 0.77399078175 0.3839859555 1.163995608 ZT8-11 2.85302827175 2.0582240005 3.647832543 ZT12-15 4.5666787335 3.964953368 5.168404099 ZT16-19 2.7187535172499997 2.4085084 3.0289986344999997 ZT20-23 4.468517362 3.778836384 5.15819834