condition mean min max ZT0-3 15.569449 15.569449 15.569449 ZT4-7 11.161462499999999 11.161462499999999 11.161462499999999 ZT8-11 10.1188595 10.1188595 10.1188595 ZT12-15 11.1545 11.1545 11.1545 ZT16-19 10.526957 10.526957 10.526957 ZT20-23 10.022346 10.022346 10.022346