Anyone know what 0.5 ± 0.50 kcal·min-1 means?

[kage65]

I'm trying to interpret a research paper, and in regards to VO2max it says "At 50% VO2max, Polar S810i and SWA significantly overestimated EE by 0.5 ± 0.50 kcal·min-1" talking about a heart rate monitor and an activity monitor. Problem is I don't know the significance of 0.5 ± 0.50 kcal·min-1 (-1 is a power of)
Any help appreciated, thanks.

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[Abstractions]

It's saying that it overestimated EE (not sure what that is) by an average of 0.5 kcal per minute, while the range is overestimation goes from 0 kcal per minute to 1 kcal per minute.

 

[kage65]

Oh ok. EE is referring to energy expenditure here btw. I've figured it was calories per minute but was not sure. Strange why they must write as kcal multiplied by minutes to the power of 1 rather than just "kcal/minute". Thanks.