condition mean min max ZT0-3 158.481373 158.481373 158.481373 ZT4-7 192.8813855 192.8813855 192.8813855 ZT8-11 294.55591549999997 294.55591549999997 294.55591549999997 ZT12-15 310.9005635 310.9005635 310.9005635 ZT16-19 273.770518 273.770518 273.770518 ZT20-23 320.2851985 320.2851985 320.2851985