condition mean min max ZT0-3 13.173449999999999 13.0351 13.3118 ZT4-7 11.854949999999999 11.854949999999999 11.854949999999999 ZT8-11 12.44165 12.44165 12.44165 ZT12-15 0 0 0 ZT16-19 14.3045 14.3045 14.3045 ZT20-23 16.21085 16.21085 16.21085