condition mean min max ZT0-3 21.0182 18.1882 23.8482 ZT4-7 11.9897 11.9897 11.9897 ZT8-11 10.53286 10.53286 10.53286 ZT12-15 0 0 0 ZT16-19 16.973999999999997 16.973999999999997 16.973999999999997 ZT20-23 16.4458 16.4458 16.4458