condition mean min max ZT0-3 14.149999999999999 14.149999999999999 14.149999999999999 ZT4-7 23.3 23.3 23.3 ZT8-11 24.799999999999997 24.799999999999997 24.799999999999997 ZT12-15 18.849999999999998 18.849999999999998 18.849999999999998 ZT16-19 17.1 17.1 17.1 ZT20-23 42.15 42.15 42.15