condition mean min max ZT0-3 9.81538 5.6466899999999995 12.518650000000001 ZT4-7 2.82597 2.82597 2.82597 ZT8-11 2.8541499999999997 2.8541499999999997 2.8541499999999997 ZT12-15 3.329235 2.972125 3.686345 ZT16-19 4.618320000000001 4.618320000000001 4.618320000000001 ZT20-23 9.626175 9.626175 9.626175