Skip to main content

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