condition mean min max ZT0-3 0.47246274999999993 0.2971945 0.647731 ZT4-7 0.47518099999999996 0.47518099999999996 0.47518099999999996 ZT8-11 0.5337785 0.5337785 0.5337785 ZT12-15 0 0 0 ZT16-19 0.2633356 0.2633356 0.2633356 ZT20-23 0.2051635 0.2051635 0.2051635