condition mean min max ZT0-3 209.232057 209.232057 209.232057 ZT4-7 186.86216050000002 186.86216050000002 186.86216050000002 ZT8-11 191.31361900000002 191.31361900000002 191.31361900000002 ZT12-15 205.4019505 205.4019505 205.4019505 ZT16-19 205.5035835 205.5035835 205.5035835 ZT20-23 189.292754 189.292754 189.292754