condition mean min max ZT0-3 2.6508695 0.3361185 5.164575 ZT4-7 1.4531 1.4531 1.4531 ZT8-11 0.1672235 0.1672235 0.1672235 ZT12-15 3.4973275 2.95665 4.038005 ZT16-19 0.000657595 0.000657595 0.000657595 ZT20-23 0.8366425 0.8366425 0.8366425