condition mean min max ZT0-3 195.795113 195.795113 195.795113 ZT4-7 291.0393945 291.0393945 291.0393945 ZT8-11 325.304218 325.304218 325.304218 ZT12-15 320.955219 320.955219 320.955219 ZT16-19 241.466584 241.466584 241.466584 ZT20-23 221.60976349999999 221.60976349999999 221.60976349999999