condition mean min max ZT0-3 13.48479 13.48479 13.48479 ZT4-7 18.1695195 18.1695195 18.1695195 ZT8-11 16.2939885 16.2939885 16.2939885 ZT12-15 16.0701225 16.0701225 16.0701225 ZT16-19 13.680617999999999 13.680617999999999 13.680617999999999 ZT20-23 16.360701499999998 16.360701499999998 16.360701499999998