condition mean min max ZT0-3 3.0767575000000003 2.2561 3.897415 ZT4-7 1.42775 1.42775 1.42775 ZT8-11 1.5402200000000001 1.5402200000000001 1.5402200000000001 ZT12-15 0 0 0 ZT16-19 2.6028849999999997 2.6028849999999997 2.6028849999999997 ZT20-23 2.1515750000000002 2.1515750000000002 2.1515750000000002