condition mean min max ZT0-3 4369.971091 4369.971091 4369.971091 ZT4-7 7182.464764 7182.464764 7182.464764 ZT8-11 6794.89479 6794.89479 6794.89479 ZT12-15 6238.1759665 6238.1759665 6238.1759665 ZT16-19 5080.976418 5080.976418 5080.976418 ZT20-23 5112.497316000001 5112.497316000001 5112.497316000001