condition mean min max ZT0-3 1095.621873 1095.621873 1095.621873 ZT4-7 720.7705805 720.7705805 720.7705805 ZT8-11 832.5207665 832.5207665 832.5207665 ZT12-15 764.5358025 764.5358025 764.5358025 ZT16-19 1429.7415565000001 1429.7415565000001 1429.7415565000001 ZT20-23 1334.6164815 1334.6164815 1334.6164815