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Table 4 Comparison of the PIN3 physical activity questionnaire to the accelerometer using Spearman correlation coefficients (SCC) with 95% confidence intervals (CI), using perceived intensity

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

  Accelerometry in hours/week using cutpoints *
  Freedson et al Swartz et al Troiano et al
  SCC (95% CI) SCC (95% CI) SCC (95% CI)
Questionnaire (hours/week)    
Moderate activity    
   Full sample** 0.25 (0.11, 0.39) 0.33 (0.18, 0.47) 0.25 (0.11, 0.39)
   Complete Actigraph sample*** 0.16 (-0.01, 0.34) 0.25 (0.08, 0.43) 0.16 (-0.01, 0.34)
   Imputed data sample# 0.20 (0.06, 0.34) -0.03 (-0.19, 0.12) 0.20 (0.06, 0.35)
Vigorous activity    
   Full sample** 0.29 (0.13, 0.45) 0.26 (0.11, 0.42) 0.32 (0.16, 0.47)
   Complete Actigraph sample*** 0.32 (0.13, 0.51) 0.32 (0.13, 0.51) 0.33 (0.14, 0.52)
   Imputed data sample# 0.29 (0.14, 0.45) 0.27 (0.11, 0.42) 0.32 (0.16, 0.48)
Moderate to vigorous activity    
   Full sample** 0.29 (0.15, 0.42) 0.34 (0.20, 0.48) 0.28 (0.14, 0.41)
   Complete Actigraph sample*** 0.23 (0.06, 0.40) 0.30 (0.13, 0.47) 0.22 (0.05, 0.39)
   Imputed data sample# 0.24 (0.10, 0.37) 0.002 (-0.15, 0.16) 0.23 (0.10, 0.37)
  1. *The cutpoints on accelerometer counts per minute were defined as follows:
  2. Freedson et al: 1952-5724 (Moderate); > = 5725 (Vigorous)
  3. Swartz et al: 574-4944 (Moderate); > = 4945 (Vigorous)
  4. Troiano et al: 2020-5998 (Moderate); > = 5999 (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