condition mean min max ZT0-3 163.259581 163.259581 163.259581 ZT4-7 162.9387145 162.9387145 162.9387145 ZT8-11 192.34823649999998 192.34823649999998 192.34823649999998 ZT12-15 206.807437 206.807437 206.807437 ZT16-19 216.676087 216.676087 216.676087 ZT20-23 186.20866 186.20866 186.20866