condition mean min max ZT0-3 0.29718574999999997 0.1068005 0.487571 ZT4-7 0.1763589 0.1763589 0.1763589 ZT8-11 0.7856745 0.7856745 0.7856745 ZT12-15 0 0 0 ZT16-19 0.9092370000000001 0.9092370000000001 0.9092370000000001 ZT20-23 0.876756 0.876756 0.876756