condition mean min max ZT0-3 18.029798 18.029798 18.029798 ZT4-7 13.6306945 13.6306945 13.6306945 ZT8-11 14.562642499999999 14.562642499999999 14.562642499999999 ZT12-15 15.465862999999999 15.465862999999999 15.465862999999999 ZT16-19 15.8153 15.8153 15.8153 ZT20-23 11.9378145 11.9378145 11.9378145