condition mean min max ZT0-3 220.225685125 184.31224175 256.1391285 ZT4-7 127.024272 118.46352265 135.58502135 ZT8-11 152.4202349 138.0234229 166.81704689999998 ZT12-15 198.607621825 187.4015746 209.81366905 ZT16-19 269.66266795 247.40063745000003 291.92469844999994 ZT20-23 326.74333487499996 325.58697874999996 327.89969099999996