Want to know if your users are sleeping better now than they have been in the past? 

Sleep helps you focus on your most chronically fatigued users. Using Trend, it's easier than ever to see who's improving, who's not, and who's regressing. 

The number under trend can be understood as: The change in average ReadiScore when comparing the most recent data to the older data in the date range you chose. 

So if you see a +2, then the average ReadiScore has gone up by 2 points. If you see a -2, then the average ReadiScore has dropped by 2 points, and a grey "0" means there was no change.
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You need to select a date range of at least 14 days of data with a ReadiScore. The number in the Trend column is calculated using the average ReadiScore in the most recent half of the date range, minus the average ReadiScore in the other half of the date range. This means you’ll need to have ReadiScore data in both halves of your date range for this calculation to work. 

For example: If you select the date range Feb 1-28, the average ReadiScore from Feb 1-14 is compared to the average ReadiScore from Feb 15-28. 

Average ReadiScore from Feb 15-28  - Average ReadiScore from Feb 1-14 = Trend number
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As long as there are 14 days of ReadiScores within the date range you select, with ReadiScore data in both halves of the date range, you’ll see a number in this column. Otherwise, you’ll get a “-”, meaning Trend couldn’t be calculated.