condition mean min max ZT0-3 57.745774 57.745774 57.745774 ZT4-7 56.7957785 56.7957785 56.7957785 ZT8-11 53.2791645 53.2791645 53.2791645 ZT12-15 69.16182549999999 69.16182549999999 69.16182549999999 ZT16-19 65.64563849999999 65.64563849999999 65.64563849999999 ZT20-23 71.5098035 71.5098035 71.5098035