condition mean min max ZT0-3 654.45148 654.45148 654.45148 ZT4-7 573.169118 573.169118 573.169118 ZT8-11 545.5489924999999 545.5489924999999 545.5489924999999 ZT12-15 623.6941025 623.6941025 623.6941025 ZT16-19 608.1267435 608.1267435 608.1267435 ZT20-23 465.5383435 465.5383435 465.5383435