condition mean min max ZT0-3 0.168187595 0.11944258 0.21693261 ZT4-7 0.49369304425 0.23075228250000002 0.756633806 ZT8-11 1.6989319965000003 1.1445030635 2.2533609295000003 ZT12-15 3.45997686975 2.7736251060000003 4.1463286335 ZT16-19 2.87953676975 2.424867564 3.3342059755 ZT20-23 3.074741661 2.7126500385 3.4368332834999995