condition mean min max ZT0-3 33.739075 32.91455 34.5636 ZT4-7 18.5384 18.5384 18.5384 ZT8-11 17.80355 17.80355 17.80355 ZT12-15 0 0 0 ZT16-19 37.3622 37.3622 37.3622 ZT20-23 37.032250000000005 37.032250000000005 37.032250000000005