condition mean min max ZT0-3 17.37045 16.500700000000002 18.2402 ZT4-7 12.37265 12.37265 12.37265 ZT8-11 17.10405 17.10405 17.10405 ZT12-15 0 0 0 ZT16-19 19.2221 19.2221 19.2221 ZT20-23 16.601399999999998 16.601399999999998 16.601399999999998