Reproducibility of physical activity recall over fifteen years: longitudinal evidence from the CARDIA study

BMC Public Health

Table 4 Factors associated with adjusted mean differences between physical activity scores reported at baseline and recalled historically, stratified by intensity (n = 3,561)

	Moderate-intensity activity score difference	Vigorous-intensity activity score difference
	Least squares mean^b	Least squares mean^b
Baseline physical activity score^a
1^st quartile	78.9	191.1
2^nd quartile	50.8	165.2
3^rd quartile	−8.6	96.4
4^th quartile	−92.8	−19.8
Sex^c
Male	16.0	170.1
Female	−1.8	46.4
Race^c
White	−2.1	61.6
Black	16.3	154.9
Age at Year 0
18-24 years	6.9	103.4
25-30 years	7.2	113.0
Education at Year 15^d
High school or Less	0.3	99.6
Some College	3.9	103.6
College Graduate	17.2	121.5
Body Mass Index at Year 15^d
Normal weight (<25 kg/m²)	3.3	97.9
Overweight (25–29 kg/m²)	3.5	115.7
Obese (≥30 kg/m²)	14.4	111.1
Sex & Race Interaction^c
Black Males	31.4	242.6
Black Females	1.3	67.2
White Males	0.6	97.6
White Females	−4.8	25.6
Race & Education Interaction^c
Black, High School or Less	−1.3	122.1
Black, Some College	17.0	165.4
Black, College Graduate	33.3	177.2
White, High School or Less	1.9	77.1
White, Some College	−9.1	41.8
White, College Graduate	0.8	65.8
PA Level & Age at Year 0 Interaction^c
1^st quartile, 18–25 years	85.1	200.2
1^st quartile, 26–34 years	70.7	182.0
2^nd quartile, 18–25 years	57.2	166.1
2^nd quartile, 26–34 years	44.6	164.3
3^rd quartile, 18–25 years	−14.9	108.4
3^rd quartile, 26–34 years	−2.4	84.4
4^th quartile, 18–25 years	−99.7	−61.0
4^th quartile, 26–34 years	−86.0	21.4

^a CARDIA Physical Activity Score = sum (for moderate or vigorous) MET level x months of infrequent activity plus 3 x months of frequent activity.
^b Difference scores = Recall – Baseline; positive least squares means represent over-reporting.
^c p < 0.05.
^d p < 0.05 for moderate-intensity activity score only.

ISSN: 1471-2458