condition mean min max ZT0-3 0.07862920000000001 0.0264549 0.13080350000000002 ZT4-7 0.036296999999999996 0.036296999999999996 0.036296999999999996 ZT8-11 0.0 0.0 0.0 ZT12-15 0.042134270833333334 0.014547475 0.06972106666666666 ZT16-19 0.0245554 0.0 0.0491108 ZT20-23 0 0 0