condition mean min max ZT0-3 33.15 33.15 33.15 ZT4-7 37.9 37.9 37.9 ZT8-11 41.55 41.55 41.55 ZT12-15 44.349999999999994 44.349999999999994 44.349999999999994 ZT16-19 48.65 48.65 48.65 ZT20-23 34.95 34.95 34.95