condition mean min max ZT0-3 0.61410762675 0.484803489 0.7434117645 ZT4-7 1.9134601682499999 1.3062732259999998 2.5206471105 ZT8-11 3.32369703175 2.8506660865 3.7967279769999998 ZT12-15 3.9105594997499997 2.908205139 4.9129138605 ZT16-19 1.6635606047500002 1.5426866115000002 1.7844345980000003 ZT20-23 2.17663563975 2.066428247 2.2868430325