condition mean min max ZT0-3 457.1 457.1 457.1 ZT4-7 267.9 267.9 267.9 ZT8-11 304.35 304.35 304.35 ZT12-15 534.95 534.95 534.95 ZT16-19 527.0 527.0 527.0 ZT20-23 599.15 599.15 599.15