condition mean min max ZT0-3 0.311622 0.0 0.623244 ZT4-7 0.042251000000000004 0.042251000000000004 0.042251000000000004 ZT8-11 0.0 0.0 0.0 ZT12-15 0.089638125 0.06253325 0.116743 ZT16-19 0.2067135 0.185523 0.227904 ZT20-23 0 0 0