condition mean min max ZT0-3 1.2916075 0.0 2.583215 ZT4-7 0.3637515 0.3637515 0.3637515 ZT8-11 2.211135 2.211135 2.211135 ZT12-15 0 0 0 ZT16-19 0.362343 0.362343 0.362343 ZT20-23 0.0 0.0 0.0