condition mean min max ZT0-3 46.85 46.85 46.85 ZT4-7 39.0 39.0 39.0 ZT8-11 29.85 29.85 29.85 ZT12-15 39.5 39.5 39.5 ZT16-19 47.349999999999994 47.349999999999994 47.349999999999994 ZT20-23 43.5 43.5 43.5