condition mean min max ZT0-3 52.68075 52.31425 53.047250000000005 ZT4-7 41.773799999999994 41.773799999999994 41.773799999999994 ZT8-11 36.3675 36.3675 36.3675 ZT12-15 0 0 0 ZT16-19 51.1411 51.1411 51.1411 ZT20-23 64.3854 64.3854 64.3854