Estimote stickers power attribute

I’m using the nodejs module bleacon. When scanning, i’m getting values for power as 1, 2, 3, 7, 5, 6, 4 or 8. Do these values map to the actual measured power? If not, what do these numbers represent?

It is in fact the power with which the sticker transmits the packets. (I believe 1 being -30 dBm, and 8 being +4 dBm.)