condition mean min max ZT0-3 6154.732057 6154.732057 6154.732057 ZT4-7 2702.5848385 2702.5848385 2702.5848385 ZT8-11 1113.8240225 1113.8240225 1113.8240225 ZT12-15 895.9748555 895.9748555 895.9748555 ZT16-19 2577.958058 2577.958058 2577.958058 ZT20-23 5140.1265645 5140.1265645 5140.1265645