condition mean min max ZT0-3 0.6293335 0.6293335 0.6293335 ZT4-7 0.266421 0.266421 0.266421 ZT8-11 0.280883 0.280883 0.280883 ZT12-15 0.7736000000000001 0.7736000000000001 0.7736000000000001 ZT16-19 2.17626 2.17626 2.17626 ZT20-23 1.20358 1.20358 1.20358