condition mean min max ZT0-3 9.681787 9.681787 9.681787 ZT4-7 10.018628499999998 10.018628499999998 10.018628499999998 ZT8-11 11.205339500000001 11.205339500000001 11.205339500000001 ZT12-15 11.947957 11.947957 11.947957 ZT16-19 10.226924 10.226924 10.226924 ZT20-23 11.701205 11.701205 11.701205