condition mean min max ZT0-3 1365.836653 1365.836653 1365.836653 ZT4-7 1310.8253025 1310.8253025 1310.8253025 ZT8-11 1223.120177 1223.120177 1223.120177 ZT12-15 1402.5624910000001 1402.5624910000001 1402.5624910000001 ZT16-19 1563.496087 1563.496087 1563.496087 ZT20-23 1731.521018 1731.521018 1731.521018