condition mean min max ZT0-3 5.842945 5.805665 5.880224999999999 ZT4-7 8.89012 8.89012 8.89012 ZT8-11 9.69778 9.69778 9.69778 ZT12-15 0 0 0 ZT16-19 9.142445 9.142445 9.142445 ZT20-23 8.38273 8.38273 8.38273