condition mean min max ZT0-3 261.2 261.2 261.2 ZT4-7 403.1 403.1 403.1 ZT8-11 496.15 496.15 496.15 ZT12-15 458.0 458.0 458.0 ZT16-19 348.85 348.85 348.85 ZT20-23 349.35 349.35 349.35