condition mean min max ZT0-3 49.1454 47.348150000000004 50.94265 ZT4-7 33.1482 33.1482 33.1482 ZT8-11 21.41955 21.41955 21.41955 ZT12-15 0 0 0 ZT16-19 41.3549 41.3549 41.3549 ZT20-23 39.85435 39.85435 39.85435