4 The Short Physical Performance Battery does not correlate with daily life gait quality and quantity | 63 Inferential statistics Data were not normally distributed and thus Spearman’s correlation coefficients were estimated to assess the correlation between the SPPB score and the 50th percentile of the gait quality and quantity measures to represent the median or typical performance. A correlation was considered to be weak if between 0-0.3, a moderate correlation if between 0.3-0.6 and a strong correlation if between 0.6-1 (214). Sensitivity analysis An additional explorative analysis was performed to assess the Spearman’s correlation coefficients between the SPPB score and the best observed or ‘optimal’ performance, which is for most measures the 90th percentile, otherwise the 10th percentile. RESULTS Figure 4.1 shows a flowchart of the inclusion process of the participants. A total of 264 participants were included, of which 229 participants were included in the analysis. The median wear time was 6 days (IQR: 5-6) and a number of 195 participants (85%) wore the sensor for 5 days or more.
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