Please review the main metrics for Interstitial traffic:
Group - is a chosen breakdown, one of the following entities: Country | Creative | Campaign | Browser | Connection Type | IP address | Platform | Proxy Type | Referer Host | Spot | Stream | Website.
Impressions - the number of times your ads were shown.
Cost - is the amount you paid for shown ads.
rCPM - is the amount you paid for 1000 impressions. It's calculated according to the formula Cost/Impressions*1000.
Conv. 1 - the number of conversions_101 you have passed using Pixel or Post URL.
eCPA 1 - is the amount you paid for 1 conversion_101. It's calculated according to the formula Cost/Conv. 1.
CTR 1 - is the click-through rate. It's calculated according to the formula
Conv. 1/Impressions *100%.