Measuring physical activity among pregnant women using a structured one-week recall questionnaire: evidence for validity and reliability

Table 2 Comparison of the PIN3 physical activity questionnaire to the diary card using Spearman correlation coefficients (SCC) with 95% confidence intervals (CI)

Comparison Variables*	Diary Card (n = 177) SCC (95% CI)
Questionnaire using perceived intensity (hours/week)
Total physical activity	0.67 (0.57, 0.76)
Moderate activity	0.63 (0.52, 0.73)
Vigorous activity	0.68 (0.56, 0.79)
Moderate to vigorous activity	0.66 (0.56, 0.76)
Questionnaire using absolute intensity (MET-hours/week)
Total physical activity	0.63 (0.53, 0.73)
Moderate intensity defined as 3-6 METS
Moderate activity	0.62 (0.52, 0.73)
Vigorous activity	0.53 (0.39, 0.67)
Moderate to vigorous activity	0.60 (0.49, 0.70)
Moderate intensity defined as 4.8-7.1 METS
Moderate activity	0.61 (0.49, 0.74)
Vigorous activity	0.47 (0.29, 0.64)
Moderate to vigorous activity	0.69 (0.58, 0.80)

* The diary card and questionnaire variables compared to each other were intended to assess the same intensities of physical activity.

ISSN: 1479-5868