condition mean min max ZT0-3 2.39286 2.39286 2.39286 ZT4-7 2.396119 2.396119 2.396119 ZT8-11 3.9026 3.9026 3.9026 ZT12-15 0.0 0.0 0.0 ZT16-19 1.257343 1.257343 1.257343 ZT20-23 2.0655945 2.0655945 2.0655945