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Table 6 Stratified test-retest reliability of PIN3 physical activity questionnaire using intraclass correlation coefficients (ICC) with 95% confidence intervals (CI) (n = 109*)

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

  

Total moderate to vigorous hours/week (perceived exertion)

Total moderate to vigorous MET-hours/week (> = 3 METS)

Total moderate to vigorous MET-hours/week (> = 4.8 METS)

 

N

ICC (95% CI)

ICC (95% CI)

ICC (95% CI)

Interview Dates:

    

Time 1 (17-22 weeks' gestation)

66

0.64 (0.47, 0.76)

0.81 (0.70, 0.88)

0.71 (0.57, 0.81)

Time 2 (27-30 weeks' gestation)

43

0.49 (0.23, 0.69)

0.84 (0.72, 0.91)

0.81 (0.68, 0.89)

Race:

    

White

79

0.51 (0.32, 0.65)

0.87 (0.80, 0.91)

0.73 (0.61, 0.82)

Other

30

0.73 (0.52, 0.86)

0.65 (0.39, 0.82)

0.74 (0.53, 0.87)

Education:

    

High school or less

49

0.34 (0.01, 0.60)

0.80 (0.64, 0.89)

0.51 (0.22, 0.72)

Some college or above

60

0.71 (0.57, 0.80)

0.82 (0.74, 0.89)

0.75 (0.64, 0.84)

Age:

    

18-29 years

56

0.45 (0.21, 0.64)

0.87 (0.79, 0.92)

0.35 (0.08, 0.56)

30 or more years

53

0.68 (0.47, 0.81)

0.88 (0.79, 0.93)

0.82 (0.68, 0.90)

Parity:

    

Zero

53

0.58 (0.37, 0.74)

0.66 (0.47, 0.79)

0.73 (0.57, 0.83)

1 or more

56

0.56 (0.35, 0.71)

0.83 (0.73, 0.90)

0.76 (0.62, 0.85)

Prepregnancy BMI:

    

<25 kg/meters squared

63

0.51 (0.31, 0.67)

0.82 (0.72, 0.89)

0.80 (0.69, 0.87)

25 or more kg/meters squared

46

0.69 (0.50, 0.82)

0.79 (0.66, 0.88)

0.62 (0.40, 0.77)

  1. *In some cases the sample sizes may not add to 109 due to missing values.