condition mean min max ZT0-3 472.649707 472.649707 472.649707 ZT4-7 471.7943725 471.7943725 471.7943725 ZT8-11 494.821937 494.821937 494.821937 ZT12-15 583.7619445 583.7619445 583.7619445 ZT16-19 575.730288 575.730288 575.730288 ZT20-23 747.040555 747.040555 747.040555