condition mean min max ZT0-3 15.316825 13.44865 17.185 ZT4-7 16.563200000000002 16.563200000000002 16.563200000000002 ZT8-11 10.63415 10.63415 10.63415 ZT12-15 0 0 0 ZT16-19 21.663800000000002 21.663800000000002 21.663800000000002 ZT20-23 22.2312 22.2312 22.2312