condition mean min max ZT0-3 208.595232 208.595232 208.595232 ZT4-7 271.891329 271.891329 271.891329 ZT8-11 340.039408 340.039408 340.039408 ZT12-15 415.1951525 415.1951525 415.1951525 ZT16-19 246.5975865 246.5975865 246.5975865 ZT20-23 90.8536425 90.8536425 90.8536425