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Example 2:

- One-Minute Epoch Dataset

- Minimum non-zero epochs per hour required: 15%

- Ignore counts below: 0 (i.e., any value is valid)

- Ignore counts above: 0 (i.e., any value is valid)

- Beginning at 1:00pm and going until 1:59pm on a given day, 4 epochs (4 minutes) contain counts that are

between 0 and 100 counts

- Between that same time span, the remaining epochs (56 minutes) contain epochs that are 0.

- This hour would be considered INVALID because only 6.7% (4/60) of the epochs meet the criteria

Example 3:

- One-Second Epoch Dataset

- Consecutive minutes of zeros to be considered invalid: 10

- Ignore counts below: 0 (i.e., any value is valid)

- Ignore counts above: 0 (i.e., any value is valid)

- Beginning at 7:00am and going until 7:15am on a given day in the dataset, 600 consecutive epochs (10 minutes)

contain counts that are between 1 and 6000 counts and 300 consecutive epochs (5 minutes) contain no valid

data (0 valued epochs).

- Between 7:15am and going until 7:59am on that same day, 540 consecutive epochs (9 minutes) contain counts

with no valid data (0 valued epochs) followed by 2160 consecutive epochs (36 minutes) containing values that

are between 1 and 4000 counts.

- This hour would be considered VALID because there are no 10 minute consecutive spans of 0 count data

between 7:00am and 7:59am.

Stage 2: Day Qualifiers

Stage 1 sets criteria for individual hours within a dataset. Stage 2 excludes days based on the number of valid hours

identified in Stage 1 by selecting the “Minimum wear time per day in hours” as shown in Figure 39.

Figure 39 – Day Qualifier for Wear Time Validation

Day Qualifier Example:

- Three-day long dataset

- Minimum wear time per day in hours: 8

- Stage 1 identifies day 1 as having 4 valid hours; day 2 as having 10 valid hours; and day 3 as having 7 valid hours.

- Day 1 would be flagged as invalid

- Day 2 would be flagged as valid

- Day 3 would be flagged as invalid

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ActiGraph ACTITRAINER Manual do Utilizador Página 63