condition mean min max ZT0-3 2.216815 2.019075 2.414555 ZT4-7 5.365724999999999 5.365724999999999 5.365724999999999 ZT8-11 2.5399950000000002 2.5399950000000002 2.5399950000000002 ZT12-15 0 0 0 ZT16-19 2.0814749999999997 2.0814749999999997 2.0814749999999997 ZT20-23 2.68804 2.68804 2.68804