condition mean min max ZT0-3 35.35 35.35 35.35 ZT4-7 38.9 38.9 38.9 ZT8-11 9.55 9.55 9.55 ZT12-15 21.1 21.1 21.1 ZT16-19 43.349999999999994 43.349999999999994 43.349999999999994 ZT20-23 22.1 22.1 22.1