condition mean min max ZT0-3 1.266576 0.427952 2.1052 ZT4-7 0.84237 0.84237 0.84237 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.4207285 0.4207285 0.4207285