condition mean min max ZT0-3 389.2 389.2 389.2 ZT4-7 498.3 498.3 498.3 ZT8-11 508.05 508.05 508.05 ZT12-15 504.2 504.2 504.2 ZT16-19 507.5 507.5 507.5 ZT20-23 453.0 453.0 453.0