condition mean min max ZT0-3 1.330915 1.330915 1.330915 ZT4-7 0.435282 0.435282 0.435282 ZT8-11 0.3024345 0.3024345 0.3024345 ZT12-15 0.969188 0.969188 0.969188 ZT16-19 3.683825 3.683825 3.683825 ZT20-23 2.7280499999999996 2.7280499999999996 2.7280499999999996