condition mean min max ZT0-3 11.551508333333333 2.01911 18.7137 ZT4-7 3.35492 3.35492 3.35492 ZT8-11 3.78784 3.78784 3.78784 ZT12-15 25.086175 22.9399 27.23245 ZT16-19 25.243299999999998 25.243299999999998 25.243299999999998 ZT20-23 17.865885 17.865885 17.865885