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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.