condition mean min max ZT0-3 23.68779905575 9.530223701499999 37.84537441 ZT4-7 14.977545873249998 11.208639711499998 18.746452034999997 ZT8-11 19.6501064175 17.700054270000003 21.600158565 ZT12-15 16.00926138 15.57561362 16.44290914 ZT16-19 10.1533145685 9.1454723465 11.1611567905 ZT20-23 14.023876505 12.867150055 15.180602955