condition mean min max ZT0-3 33.23713886 30.83915679 35.63512093 ZT4-7 39.149602664999996 29.164467175 49.134738154999994 ZT8-11 60.30318058750001 54.31121590000001 66.29514527500001 ZT12-15 38.094525662500004 30.505590845 45.68346048 ZT16-19 41.714853505 35.179704040000004 48.25000297 ZT20-23 80.78008366750001 67.962342465 93.59782487