condition mean min max ZT0-3 1.056111 1.056111 1.056111 ZT4-7 0.55816 0.55816 0.55816 ZT8-11 0.2715835 0.2715835 0.2715835 ZT12-15 0.4980095 0.4980095 0.4980095 ZT16-19 1.34435 1.34435 1.34435 ZT20-23 1.974465 1.974465 1.974465