How to read your SmartGuard basal chart

The summary above the chart

For the period you selected (7, 14, 30, 90, 180 or 365 days) you see a row of tiles:

• days - the number of calendar days that have any data in the period. If your history is shorter than the period you picked, this number is smaller.
• events - how many automatic basal micro-boluses the figures are based on. If you include auto-corrections, they are counted as well.
• avg / day - the average amount of automatic basal insulin per 24 hours. While auto-corrections are off, this is the only insulin tile.
• basal (U/24h), correction (U/24h) and total (U/24h) - these three replace the tile above once you include auto-corrections with the slider. Basal is the same average as before, correction is the average daily amount of auto-corrections that are counted in, and total is the two added together. The correction figure contains only the share you chose with the slider: at 10%, a tenth of the auto-correction insulin.
• The bar and percentages under the tiles - how the total splits between basal and corrections. They appear together with the three tiles above.
• Newest data - the time of the most recent delivery that has reached the server.

With fewer than 7 days of data the page shows a warning: with so little history, one unusual day can change the profile noticeably.

The chart

The chart shows an averaged, smoothed picture of a typical day in the period you chose. The horizontal axis is the time of day from 00:00 to 23:00, as shown on your pump's clock. The vertical axis is the average basal delivery in units per hour (U/h). Hover over the line, or tap it on a phone, to see the exact value for an hour. Click the chart to enlarge it.

The button above the chart switches between a step line, where the rate holds for the whole hour, and a smooth line that connects the hourly values. It changes only how the line is drawn, not the numbers.

The table

The table lists the same profile hour by hour. Average (U/h) is the calculated value with three decimals. Rounded (0.025) is that value rounded to steps of 0.025 U/h. The rounding only makes the numbers easier to compare with a pump basal pattern; check which increments your own pump accepts.

Including auto-corrections

SmartGuard also gives auto-correction boluses when glucose is above target. They are not basal insulin, so they are off by default. The slider lets you add a share of them to the figures (10, 25, 50, 75 or 100%): off is basal only, 100% is basal plus all auto-corrections. Use it to see how much the picture changes, not as a value to aim for.

What the chart does not tell you

• It describes what SmartGuard delivered in response to your glucose, meals, activity and settings during that period. It is not a measure of how much basal insulin you need.
• A longer period smooths out differences between days but also mixes in older habits. A shorter one follows recent changes but is easier to distort. It is worth looking at more than one period.
• Only automatic basal delivery and auto-corrections are used. Meal boluses, glucose readings and pump settings are not part of the analysis.