condition mean min max ZT0-3 3.364819159 3.33042311 3.399215208 ZT4-7 1.0680689827499998 1.011999779 1.1241381865 ZT8-11 2.321166226 1.6271089155 3.0152235364999997 ZT12-15 3.5760215075 3.4368833445 3.7151596705000003 ZT16-19 4.139646233750001 3.661373872 4.617918595500001 ZT20-23 5.57056172125 5.4179944965 5.723128946