condition mean min max ZT0-3 12.818995 9.577985 14.7272 ZT4-7 11.065249999999999 11.065249999999999 11.065249999999999 ZT8-11 9.17878 9.17878 9.17878 ZT12-15 8.343375 8.140015 8.546735 ZT16-19 9.352905 9.352905 9.352905 ZT20-23 13.0064 13.0064 13.0064