condition mean min max ZT0-3 17.1764 17.1764 17.1764 ZT4-7 18.0649 18.0649 18.0649 ZT8-11 10.209875 10.209875 10.209875 ZT12-15 8.942720000000001 8.942720000000001 8.942720000000001 ZT16-19 11.4995 11.4995 11.4995 ZT20-23 13.833433333333334 13.833433333333334 13.833433333333334