condition mean min max ZT0-3 2.0782049999999996 1.356245 2.800165 ZT4-7 1.8685990000000001 1.8685990000000001 1.8685990000000001 ZT8-11 0.711348 0.711348 0.711348 ZT12-15 0 0 0 ZT16-19 1.192684 1.192684 1.192684 ZT20-23 0.6678204999999999 0.6678204999999999 0.6678204999999999