condition mean min max ZT0-3 2.24272575525 1.172431713 3.3130197975 ZT4-7 3.7301682942500003 3.3429548095 4.1173817790000005 ZT8-11 5.427372305 4.527598576499999 6.3271460335 ZT12-15 5.055731571 4.797392567 5.314070575 ZT16-19 2.863380939 2.762290413 2.964471465 ZT20-23 3.090869338 2.8224852435 3.3592534325