condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0388227345 0.0 0.077645469 ZT12-15 0.039582964 0.0 0.079165928 ZT16-19 0.031067345833333333 0.0 0.062134691666666665 ZT20-23 0.0 0.0 0.0