condition mean min max ZT0-3 2.11433682325 2.0504600754999998 2.178213571 ZT4-7 5.5345284745 2.727005318 8.342051631 ZT8-11 23.328199746499998 15.708888943 30.947510549999997 ZT12-15 16.089639100249997 8.495802879 23.683475321499998 ZT16-19 3.1551390755 2.0405341775 4.2697439735 ZT20-23 0.9794372765000001 0.4226107405 1.5362638125