condition mean min max ZT0-3 6.442012500000001 4.556375 8.32765 ZT4-7 2.55606 2.55606 2.55606 ZT8-11 2.7364699999999997 2.7364699999999997 2.7364699999999997 ZT12-15 0 0 0 ZT16-19 19.2252 19.2252 19.2252 ZT20-23 3.3588050000000003 3.3588050000000003 3.3588050000000003