condition mean min max ZT0-3 8.790062 8.790062 8.790062 ZT4-7 14.608818 14.608818 14.608818 ZT8-11 11.877006999999999 11.877006999999999 11.877006999999999 ZT12-15 10.337978 10.337978 10.337978 ZT16-19 9.2930805 9.2930805 9.2930805 ZT20-23 8.651536499999999 8.651536499999999 8.651536499999999