condition mean min max ZT0-3 2.03411 1.77981 2.28841 ZT4-7 1.72838 1.72838 1.72838 ZT8-11 1.2234645 1.2234645 1.2234645 ZT12-15 0 0 0 ZT16-19 1.2866335 1.2866335 1.2866335 ZT20-23 1.94027 1.94027 1.94027