condition mean min max ZT0-3 942.802713 942.802713 942.802713 ZT4-7 412.465452 412.465452 412.465452 ZT8-11 571.181388 571.181388 571.181388 ZT12-15 1100.453424 1100.453424 1100.453424 ZT16-19 1346.0885735 1346.0885735 1346.0885735 ZT20-23 1941.007154 1941.007154 1941.007154