condition mean min max ZT0-3 0.267524 0.2096895 0.3253585 ZT4-7 0.37622900000000004 0.37622900000000004 0.37622900000000004 ZT8-11 0.21013749999999998 0.21013749999999998 0.21013749999999998 ZT12-15 0 0 0 ZT16-19 0.325869 0.325869 0.325869 ZT20-23 0.218048 0.218048 0.218048