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Table 3 Single-modality predictors of moderate-vigorous physical activity

From: Accuracy of physical activity assessment during pregnancy: an observational study

Model True False   P-
Modality Cut-off Positive Negative Positive Negative Φ value
PAR 119 13 13 26 0 0.333 0.124
PAR 105 13 12 27 0 0.316 0.158
PAR 112 13 12 27 0 0.316 0.158
SWA 448 10 24 15 3 0.333 0.124
SWA 294 13 12 27 0 0.316 0.158
SWA 301 13 12 27 0 0.316 0.158
  1. Model shows the modality (PAR = physical activity record, SWA = SenseWear® armband) and the cut-off, in minutes per week of recorded moderate-to-vigorous physical activity. True/false/positive/negative data shows the number of participants in each category (out of a total of 52 participants) compared to the reference standard. Φ is the 2 × 2 contingency correlation coefficient. Significance was set at P < 0.05.