condition mean min max ZT0-3 0.63293884475 0.461064835 0.8048128545 ZT4-7 1.540265856 1.2961961105 1.7843356015 ZT8-11 3.4972895727499997 2.535602092 4.4589770535 ZT12-15 6.969856172 6.149879397 7.789832947000001 ZT16-19 5.40054835675 5.27164342 5.5294532935 ZT20-23 5.40997362075 5.119081685 5.7008655565