condition mean min max ZT0-3 43.2 43.2 43.2 ZT4-7 39.1 39.1 39.1 ZT8-11 21.85 21.85 21.85 ZT12-15 50.349999999999994 50.349999999999994 50.349999999999994 ZT16-19 64.9 64.9 64.9 ZT20-23 44.35 44.35 44.35