condition mean min max ZT0-3 11.26783 10.14011 12.39555 ZT4-7 7.89756 7.89756 7.89756 ZT8-11 8.164525000000001 8.164525000000001 8.164525000000001 ZT12-15 0 0 0 ZT16-19 11.81727 11.81727 11.81727 ZT20-23 13.283249999999999 13.283249999999999 13.283249999999999