condition mean min max ZT0-3 386.077542 386.077542 386.077542 ZT4-7 333.8590405 333.8590405 333.8590405 ZT8-11 283.5735895 283.5735895 283.5735895 ZT12-15 263.0796325 263.0796325 263.0796325 ZT16-19 103.85958 103.85958 103.85958 ZT20-23 98.4317455 98.4317455 98.4317455