condition mean min max ZT0-3 4.56471 4.30675 4.82267 ZT4-7 10.381250000000001 10.381250000000001 10.381250000000001 ZT8-11 12.1538 12.1538 12.1538 ZT12-15 0 0 0 ZT16-19 10.16369 10.16369 10.16369 ZT20-23 7.26333 7.26333 7.26333