condition mean min max ZT0-3 12.258173 12.258173 12.258173 ZT4-7 11.1113095 11.1113095 11.1113095 ZT8-11 10.658582 10.658582 10.658582 ZT12-15 15.170801 15.170801 15.170801 ZT16-19 10.965091999999999 10.965091999999999 10.965091999999999 ZT20-23 13.8477305 13.8477305 13.8477305