condition mean min max ZT0-3 0.35179449999999995 0.185804 0.5177849999999999 ZT4-7 0.3307565 0.3307565 0.3307565 ZT8-11 0.237266 0.237266 0.237266 ZT12-15 0 0 0 ZT16-19 0.3238435 0.3238435 0.3238435 ZT20-23 0.3712955 0.3712955 0.3712955