condition mean min max ZT0-3 12.415943 12.415943 12.415943 ZT4-7 13.417598 13.417598 13.417598 ZT8-11 13.1524795 13.1524795 13.1524795 ZT12-15 11.870981 11.870981 11.870981 ZT16-19 12.2967955 12.2967955 12.2967955 ZT20-23 13.743444499999999 13.743444499999999 13.743444499999999