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Table 2 Reasons for missing toddler ankle accelerometer data (n = 277)

From: Toddler physical activity study: laboratory and community studies to evaluate accelerometer validity and correlates

Category

Specific reasons

N (%)

Valid data

--

191 (69.0 %)

Refusal

Refused to participate in physical activity assessment

38 (13.7 %)

Participant noncompliance

Lost or did not return the accelerometer

3 (1.1 %)

Wore accelerometer for less than two daysa

30 (10.8 %)

Technical problems

Staff training (i.e.: improper programming and documentation)

11 (3.9 %)

Device malfunction

4 (1.5 %)

  1. abecause the first and last days are truncated, if the participant wore the accelerometer for two or fewer days the data were not used