condition mean min max ZT0-3 9.36223 8.638490000000001 10.08597 ZT4-7 9.609175 9.609175 9.609175 ZT8-11 8.70678 8.70678 8.70678 ZT12-15 0 0 0 ZT16-19 13.67005 13.67005 13.67005 ZT20-23 10.68951 10.68951 10.68951