condition mean min max ZT0-3 11.849084999999999 10.876619999999999 12.82155 ZT4-7 6.175224999999999 6.175224999999999 6.175224999999999 ZT8-11 3.7492150000000004 3.7492150000000004 3.7492150000000004 ZT12-15 0 0 0 ZT16-19 7.9761299999999995 7.9761299999999995 7.9761299999999995 ZT20-23 8.617865 8.617865 8.617865