condition mean min max ZT0-3 1.8663589594999999 0.9812289790000001 2.7514889399999998 ZT4-7 3.42898985575 3.2936722245 3.5643074869999998 ZT8-11 3.1838961575 2.3744100295 3.9933822855 ZT12-15 5.52308299475 4.338389401000001 6.7077765885 ZT16-19 1.5750741587500001 0.9958086315000001 2.154339686 ZT20-23 1.6078124817500001 1.2207244395 1.9949005240000002