condition mean min max ZT0-3 0.622455 0.622455 0.622455 ZT4-7 2.1825200000000002 2.1825200000000002 2.1825200000000002 ZT8-11 0.79146 0.79146 0.79146 ZT12-15 0.72174 0.72174 0.72174 ZT16-19 1.9016250000000001 1.9016250000000001 1.9016250000000001 ZT20-23 3.455145 3.455145 3.455145