condition mean min max ZT0-3 52.349999999999994 52.349999999999994 52.349999999999994 ZT4-7 63.9 63.9 63.9 ZT8-11 47.1 47.1 47.1 ZT12-15 57.3 57.3 57.3 ZT16-19 26.0 26.0 26.0 ZT20-23 48.75 48.75 48.75