Self-Reports in the Field Using Smartwatches: An Open-Source Firmware Solution
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We first compared the number of triggered notifications to the number of scheduled notifications in each group. Each participant took part for seven days, with five scheduled notifications per day, for a total of 35 scheduled notifications per participant. Therefore, a total of 245 notifications were scheduled across all participants in the smartwatch condition (seven participants) and 210 were scheduled across all participants in the smartphone condition (six participants). Log files showed that 240 notifications were triggered in the smartwatch condition (98.0%) and 203 notifications were triggered in the smartphone condition (96.7%; see Table 1). A ?²-test showed that the two groups did not significantly differ in the ratio of received notifications to scheduled notifications, ?² = 0.32, df = 1, p = 0.573.Compliance was assessed as the fraction of responses relative to the number of scheduled notifications. As the number of received notifications can be lower than the number of scheduled notifications, we also calculated completion as the rate of responses relative to the number of received notifications. See Table 1 for an overview.
We performed a ?²-test to test for a relationship between group and compliance, which indicated a significant group-dependence (?² = 24.63, df = 1, p < 0.001). The risk ratio of that relation is RR = 1.39 (i.e., participants in the smartwatch group were 1.39 times more likely to answer a scheduled notification as participants in the smartphone group).