condition mean min max ZT0-3 16.964175 16.933100000000003 16.99525 ZT4-7 20.478 20.478 20.478 ZT8-11 28.33565 28.33565 28.33565 ZT12-15 0 0 0 ZT16-19 22.6532 22.6532 22.6532 ZT20-23 24.099 24.099 24.099