condition mean min max ZT0-3 0.3735266666666667 0.31587750000000003 0.441526 ZT4-7 0.842821 0.842821 0.842821 ZT8-11 1.58061 1.58061 1.58061 ZT12-15 1.1089195 0.900849 1.31699 ZT16-19 0.9598070000000001 0.9598070000000001 0.9598070000000001 ZT20-23 0.731649 0.731649 0.731649