condition mean min max ZT0-3 155.36584525 140.4504226 170.2812679 ZT4-7 138.225685325 136.6068543 139.84451635 ZT8-11 153.3311953 138.01223844999998 168.65015215 ZT12-15 56.8733895425 22.22961753 91.517161555 ZT16-19 19.614298214999998 19.08732826 20.14126817 ZT20-23 16.58705549 13.53335747 19.64075351