condition mean min max ZT0-3 10.758475 10.758475 10.758475 ZT4-7 12.069737 12.069737 12.069737 ZT8-11 10.758475 10.758475 10.758475 ZT12-15 12.198399 12.198399 12.198399 ZT16-19 11.477364999999999 11.477364999999999 11.477364999999999 ZT20-23 10.4907395 10.4907395 10.4907395