condition mean min max ZT0-3 13.291517 13.291517 13.291517 ZT4-7 12.4988065 12.4988065 12.4988065 ZT8-11 13.526953 13.526953 13.526953 ZT12-15 14.110512 14.110512 14.110512 ZT16-19 14.743737 14.743737 14.743737 ZT20-23 12.339064 12.339064 12.339064