condition mean min max ZT0-3 1.4855055 1.1399110000000001 1.8311 ZT4-7 2.9438649999999997 2.9438649999999997 2.9438649999999997 ZT8-11 1.2181555 1.2181555 1.2181555 ZT12-15 0 0 0 ZT16-19 1.8691825 1.8691825 1.8691825 ZT20-23 1.4096950000000001 1.4096950000000001 1.4096950000000001