condition mean min max ZT0-3 1.27549007775 1.226859422 1.3241207335 ZT4-7 2.104507211 1.2840453145000001 2.9249691075 ZT8-11 3.5006843565 3.234406588 3.766962125 ZT12-15 2.0631096845 1.8288078015000002 2.2974115675 ZT16-19 1.729509722 1.4035806499999999 2.055438794 ZT20-23 1.529549877 1.2352529214999999 1.8238468325000001