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Table 4 Composite predictors of moderate-vigorous physical activity

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

Cut-off True False Φ P-value
PAR (min) SWA
(min)
Positive Negative Positive Negative   
280 385 8 36 3 5 0.571 0.0007
182 385 10 32 7 3 0.544 0.0015
259 385 8 35 4 5 0.527 0.0024
280 350 8 35 4 5 0.527 0.0024
210 385 9 33 6 4 0.515 0.0032
168 385 10 31 8 3 0.513 0.0033
280 400 7 36 3 6 0.507 0.0039
259 350 8 34 5 5 0.487 0.0063
  1. Cut-off shows the cut-off time for each modality (PAR = physical activity record, SWA = SenseWear® armband) in minutes per week. 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.