Table 4

Test-Retest Reliability of the SRTS Parent Survey

n

% Agreement

Kappa Coefficient (95% CI)


Q3: How many children do you have in Kindergarten through 8th grade?

112

91.1

0.85 (0.72, 0.99)


Q5: How far does your child live from school?

112

72.3

0.65 (0.56, 0.74)


Q5: How far does your child live from school?

110

93.3

0.77 (0.65, 0.90) w


Q6a: On most days, how does your child arrive for school?

112

98.2

0.97 (0.83, 1.11)


Q6b: On most days, how does your child leave from school?

112

92.9

0.85 (0.72, 0.98)


Q7a: How long does it normally take your child to get to school?

112

75.9

0.67 (0.56, 0.77)


Q7a: How long does it normally take your child to get to school?

111

94.6

0.76 (0.64, 0.88) w


Q7b: How long does it normally take your child to get from school?

112

71.4

0.62 (0.52, 0.72)


Q7b: How long does it normally take your child to get from school?

108

94.3

0.76 (0.64, 0.88) w


Q8: Has your child asked you for permission to walk or bike to/from school in the past year?

112

86.6

0.74 (0.56, 0.92)


Q9: At what grade would you allow your child to walk or bike to/from school without an adult?

112

74.1

0.57 (0.48, 0.66)


Q9 alt: Would you allow your child to walk/bike at any grade?

112

87.5

0.74 (0.56, 0.92)


Q11a: My child already walks/bikes to school

112

96.4

0.76 (0.57, 0.94)


Q12: In your opinion, how much does your child's school encourage or discourage walking and biking to/from school?

112

68.8

0.47 (0.34, 0.59)


Q13: How much fun is walking or biking to/from school for your child?

112

72.3

0.61 (0.50, 0.72)


Q14: How healthy is walking or biking to/from school for your child?

112

72.3

0.51 (0.38, 0. 65)


Q15: What is the highest grade or year of school you completed?

112

96.4

0.93 (0.81, 1.04)


"w" specifies "weights 1-|i-j|/(k-1), where i and j index the rows and columns of the ratings by the two raters and k is the maximum number of possible ratings" (http://www.stata.com/help.cgi?kappa#Options webcite)

Missing is coded as a valid value except for weighted kappa coefficients

McDonald et al. International Journal of Behavioral Nutrition and Physical Activity 2011 8:56   doi:10.1186/1479-5868-8-56

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