condition mean min max ZT0-3 1.40382575 0.4718915 2.33576 ZT4-7 3.7687600000000003 3.7687600000000003 3.7687600000000003 ZT8-11 5.189475 5.189475 5.189475 ZT12-15 0 0 0 ZT16-19 7.42997 7.42997 7.42997 ZT20-23 1.86685 1.86685 1.86685