condition mean min max ZT0-3 53.90826666666666 36.3093 79.60305 ZT4-7 35.77135 35.77135 35.77135 ZT8-11 9.54589 9.54589 9.54589 ZT12-15 17.230125 14.7641 19.696150000000003 ZT16-19 10.6943 10.6943 10.6943 ZT20-23 23.746699999999997 23.746699999999997 23.746699999999997