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Table 1 Descriptives for the calibration and cross-validation samples stratified by age group

From: Calibration of self-report tools for physical activity research: the Physical Activity Questionnaire (PAQ)

Age group Younger Older Combined  
Calibration sample n = 71 n = 32 n = 103  
  M ± SD M ± SD M ± SD p
Age (y) 9.7 ± 1.1 13.3 ± 1.3 10.8 ± 2.0 <.001
Gender (% male)1 47.9 46.9 47.6 .920
Height (cm) 141.0 ± 7.9 160.5 ± 11.7 146.8 ± 12.7 <.001
Weight (kg) 37.4 ± 9.8 60.7 ± 19.3 44.6 ± 17.2 <.001
BMI (kg/m2) 18.6 ± 3.8 23.2 ± 5.6 20.1 ± 4.9 <.001
Obese (%)1 12.7 28.1 17.4 .056
Spring (%)1 57.8 56.2 57.3 .800
MVPAmin (min) 60.7 ± 23.1 37.6 ± 20.1 53.5 ± 24.6 <.001
MVPA weekday (%) 8.0 ± 3.3 5.0 ± 2.5 7.1 ± 3.3 <.001
MVPA weekend (%) 8.0 ± 4.2 4.9 ± 5.3 7.0 ± 4.8 <.001
AA (cpm/day) 475.4 ± 114.7 429.8 ± 137.9 461.2 ± 123.5 .080
AM wear time (d) 6.0 ± 0.9 5.6 ± 0.9 5.9 ± 0.9 .025
PAQ (0–5 scale) 3.2 ± 0.7 2.8 ± 0.6 3.1 ± 0.7* .005
Cross-validation sample n = 32 n = 13 n = 45  
  M ± SD M ± SD M ± SD p
Age (y) 8.4 ± 3.1 13.1 ± 1.0 10.6 ± 1.9 <.001
Gender (% male)1 62.5 53.9 60 .590
Height (cm) 140.7 ± 8.4 157.0 ± 10.9 145.3 ± 11.7 <.001
Weight (kg) 37.3 ± 9.4 46.9 ± 11.0 40.1 ± 10.7 .001
BMI (kg/m2) 18.7 ± 3.6 18.9 ± 2.8 18.8 ± 3.3 .890
Obese (%)1 0 0 0 na
Spring (%)1 46.9 61.5 51.1 .370
MVPAmin (min) 61.4 ± 21.7 39.0 ± 19.4 55.7 ± 22.2 <.001
MVPA week day (%) 8.4 ± 3.1 5.5 ± 2.6 7.6 ± 3.2 .005
MVPA weekend day (%) 8.4 ± 4.7 4.0 ± 3.0 7.1 ± 4.7 .003
AA (cpm/day) 491.0 ± 100.5 434.6 ± 125.1 474.7 ± 109.8 .120
AM wear time (d) 6.2 ± 0.8 5.5 ± 1.1 6.0 ± 0.9 .014
PAQ (0–5 scale) 3.5 ± 0.5 2.9 ± 0.5 3.3 ± 0.6 <.001
  1. p-values relate to age group comparison tests.
  2. 1Tested using Pearson chi-square test.
  3. *Significantly different than the cross-validation sample.
  4. M ± SD = mean ± standard deviation.
  5. na = not applicable.
  6. AA = Average activity.
  7. AM = Activity monitor.