condition mean min max ZT0-3 62.1 62.1 62.1 ZT4-7 50.7 50.7 50.7 ZT8-11 67.0 67.0 67.0 ZT12-15 48.349999999999994 48.349999999999994 48.349999999999994 ZT16-19 34.1 34.1 34.1 ZT20-23 92.45 92.45 92.45