condition mean min max ZT0-3 580.456412 580.456412 580.456412 ZT4-7 639.1037425 639.1037425 639.1037425 ZT8-11 641.3448895 641.3448895 641.3448895 ZT12-15 602.5094245 602.5094245 602.5094245 ZT16-19 744.7850615 744.7850615 744.7850615 ZT20-23 803.3054135 803.3054135 803.3054135