condition mean min max ZT0-3 37.9 37.9 37.9 ZT4-7 34.9 34.9 34.9 ZT8-11 55.349999999999994 55.349999999999994 55.349999999999994 ZT12-15 43.349999999999994 43.349999999999994 43.349999999999994 ZT16-19 41.05 41.05 41.05 ZT20-23 49.85 49.85 49.85