condition mean min max ZT0-3 25.85 25.85 25.85 ZT4-7 5.7 5.7 5.7 ZT8-11 45.5 45.5 45.5 ZT12-15 34.5 34.5 34.5 ZT16-19 13.149999999999999 13.149999999999999 13.149999999999999 ZT20-23 18.799999999999997 18.799999999999997 18.799999999999997