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Table 3 Comparison of the PIN3 physical activity questionnaire to the accelerometer using Spearman correlation coefficients (SCC) with 95% confidence intervals (CI), using absolute intensity overall and separately using 3-6 METS and 4.8-7.1 METS to define moderate activity

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

 

Accelerometry in Counts/Week Using Various Cutpoints*

Total Counts/Week

 

Freedson et al

Swartz et al

Troiano et al

 
 

SCC (95% CI)

SCC (95% CI)

SCC (95% CI)

SCC (95% CI)

Total physical activity in MET-hours/week

    

   Full sample**

   

0.23 (0.08, 0.38)

   Complete Actigraph sample***

   

0.31 (0.13, 0.49)

   Imputed data sample#

   

0.20 (0.05, 0.35)

Physical activity in MET-hours/week, using 3-6 METS to define moderate activity

   Moderate activities

    

   Full sample**

0.01 (-0.13, 0.16)

0.14 (-0.02, 0.29)

0.02 (-0.12, 0.16)

 

   Complete Actigraph sample***

0.07 (-0.11, 0.24)

0.24 (0.05, 0.43)

0.06 (-0.12, 0.24)

 

   Imputed data sample#

0.03 (-0.12, 0.17)

0.18 (0.03, 0.33)

0.02 (-0.12, 0.16)

 

   Vigorous activities

    

   Full sample**

0.34 (0.18, 0.49)

0.42 (0.28, 0.55)

0.34 (0.19, 0.50)

 

   Complete Actigraph sample***

0.38 (0.20, 0.56)

0.44 (0.28, 0.60)

0.40 (0.22, 0.57)

 

   Imputed data sample#

0.33 (0.17, 0.48)

0.41 (0.27, 0.54)

0.33 (0.18, 0.49)

 

   Moderate to vigorous activity

    

   Full sample**

0.13 (-0.02, 0.27)

0.23 (0.09, 0.38)

0.12 (-0.02, 0.27)

0.24 (0.10, 0.39)

   Complete Actigraph sample***

0.17 (0.004, 0.35)

0.32 (0.14, 0.50)

0.16 (-0.01, 0.34)

0.32 (0.14, 0.50)

   Imputed data sample#

0.13 (-0.01, 0.27)

0.21 (0.06, 0.35)

0.12 (-0.02, 0.27)

0.22 (0.07, 0.36)

Physical activity in MET-hours/week, using 4.8-7.1 METS to define moderate activity

   Moderate activities

    

   Full sample**

0.05 (-0.10, 0.20)

0.08 (-0.07, 0.23)

0.04 (-0.11, 0.19)

 

   Complete Actigraph sample***

0.05 (-0.14, 0.24)

0.05 (-0.13, 0.23)

0.04 (-0.15, 0.22)

 

   Imputed data sample#

0.04 (-0.12, 0.19)

0.04 (-0.11, 0.18)

0.03 (-0.12, 0.18)

 

   Vigorous activities

    

   Full sample**

0.29 (0.13, 0.45)

0.30 (0.15, 0.46)

0.31 (0.15, 0.47)

 

   Complete Actigraph sample***

0.32 (0.14, 0.51)

0.32 (0.14, 0.50)

0.34 (0.15, 0.52)

 

   Imputed data sample#

0.28 (0.12, 0.44)

0.29 (0.14, 0.44)

0.30 (0.14, 0.46)

 

   Moderate to vigorous activity

    

   Full sample**

0.19 (0.04, 0.33)

0.21 (0.06, 0.35)

0.18 (0.04, 0.33)

0.22 (0.07, 0.36)

   Complete Actigraph sample***

0.20 (0.02, 0.38)

0.21 (0.04, 0.38)

0.19 (0.01, 0.37)

0.21 (0.04, 0.38)

   Imputed data sample#

0.15 (0.002, 0.31)

0.10 (-0.05, 0.24)

0.16 (0.01, 0.31)

0.09 (-0.05, 0.24)

  1. *The cutpoints on accelerometer counts per minute were defined as follows:
  2. Freedson et al: 1952-5724 (Moderate); > = 5725 (Vigorous)
  3. Troiano et al: 2020-5998 (Moderate); > = 5999 (Vigorous)
  4. Swartz et al: 574-4944 (Moderate); > = 4945 (Vigorous)
  5. **Full sample n = 177
  6. ***Complete Actigraph data (n = 120) was defined as having nonmissing counts over at least 70% of a standard measurement day, with a standard measurement day defined as the length of time in which at least 70% of participants were wearing the monitor. This was defined separately for weekdays and weekends.
  7. #Imputed sample n = 177