condition mean min max ZT0-3 1.1199795 1.1199795 1.1199795 ZT4-7 0.8075065 0.8075065 0.8075065 ZT8-11 1.0171519999999998 1.0171519999999998 1.0171519999999998 ZT12-15 0.894909 0.894909 0.894909 ZT16-19 1.156178 1.156178 1.156178 ZT20-23 1.173802 1.173802 1.173802