condition mean min max ZT0-3 63.222648 63.222648 63.222648 ZT4-7 181.2622625 181.2622625 181.2622625 ZT8-11 193.9167095 193.9167095 193.9167095 ZT12-15 136.8201565 136.8201565 136.8201565 ZT16-19 96.4141565 96.4141565 96.4141565 ZT20-23 99.0495975 99.0495975 99.0495975