condition mean min max ZT0-3 5.315347500000001 5.1382650000000005 5.492430000000001 ZT4-7 4.653115 4.653115 4.653115 ZT8-11 6.447395 6.447395 6.447395 ZT12-15 0 0 0 ZT16-19 5.971769999999999 5.971769999999999 5.971769999999999 ZT20-23 7.0615950000000005 7.0615950000000005 7.0615950000000005