condition mean min max ZT0-3 527.0 527.0 527.0 ZT4-7 511.2 511.2 511.2 ZT8-11 515.95 515.95 515.95 ZT12-15 520.2 520.2 520.2 ZT16-19 507.65 507.65 507.65 ZT20-23 559.5 559.5 559.5