condition mean min max ZT0-3 2.5546912365 1.5321864280000002 3.5771960449999995 ZT4-7 6.80353158375 5.975515958500001 7.631547208999999 ZT8-11 10.0335519145 8.5131363385 11.5539674905 ZT12-15 13.143243645 11.927896035 14.358591255 ZT16-19 14.644751590000002 13.12696264 16.162540540000002 ZT20-23 13.804722345 12.524964405 15.084480285