condition mean min max ZT0-3 19.55 19.55 19.55 ZT4-7 5.1 5.1 5.1 ZT8-11 27.65 27.65 27.65 ZT12-15 33.4 33.4 33.4 ZT16-19 26.4 26.4 26.4 ZT20-23 51.349999999999994 51.349999999999994 51.349999999999994