condition mean min max ZT0-3 12.033425000000001 11.51895 12.5479 ZT4-7 14.36485 14.36485 14.36485 ZT8-11 11.642299999999999 11.642299999999999 11.642299999999999 ZT12-15 0 0 0 ZT16-19 11.35915 11.35915 11.35915 ZT20-23 13.2209 13.2209 13.2209