condition mean min max ZT0-3 336.55 336.55 336.55 ZT4-7 280.5 280.5 280.5 ZT8-11 354.75 354.75 354.75 ZT12-15 346.55 346.55 346.55 ZT16-19 429.95 429.95 429.95 ZT20-23 373.25 373.25 373.25