Table 2 Data density
Time period to display | Maximum number of data points to display | Each point represents… | Comment |
|---|---|---|---|
1 day | 48 | 30 min | An Apple Watch measures the wearer’s heart rate every 10 min. It is not inconceivable of a future which includes wearables capable of passive BP monitoring at a similar interval. If we take a more extreme measurement rate of one measurement every 10 min, a single point on the display represents the average of three data points of recordings |
1 week | 56 | 3 h | Each day is represented by eight points on the display |
2 weeks | 56 | 6 h | Each day is represented by four points on the display |
1 month | 62 | 12 h | Each day is represented by two points, with a maximum of 31 days per month |
2 months | 62 | 1 day | The maximum number of days in any 2-month period is 62 (displaying July and August) |
4 months | 62 | 2 days | The maximum number of days in any 4-month period is 123 |
6 months | 62 | 3 days | The maximum number of days in any 6-month period is 184 |
1 year | 54 | 1 week | At most a year can have 366 days, so every point on the display could represent 6 days. However, thinking in terms of weeks is more common which would correspond to a maximum of 54 distinct weeks in a calendar year |
2 years | 54 | 2 weeks | – |
3–5 years | 60 | 1 month | – |
> 5 years | 60 | 2 months | – |
> 10 years | 60 | 4 months | – |
> 15 years | 60 | 6 months | – |
> 30 years | 60 | 1 year | – |