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Table 1 Descriptive characteristics (mean (SD)) of participants includeded in the main analyses of temporal trends in physical activity (i.e.with ≥2 days of valid of accelerometer data) by agegroup, cohort and sex (n = 8186)a

From: Temporal trends in physical activity levels across more than a decade – a national physical activity surveillance system among Norwegian children and adolescents

  n a Age (yrs.) Height (cm) Weight (kg) BMI (kg.m−2) WC (cm) Socioeconomic status b
       Low (%) Medium (%) High (%) Missing (%)
BOYS
 6-y-olds
  2011 494 (475) 6.6 (0.4) 122.2 (5.8) 24.0 (3.7) 16.0 (1.6) 54.8 (4.2) 4.5% 33.2% 61.1% 1.2%
  2018 411 (403) 6.5 (0.4) 121.5 (5.5) 23.4 (3.6) 15.8 (1.6)* 54.6 (4.0) 2.9% 20.9% 60.1% 16.1%
 9-y-olds
  2005 599 (593) 9.6 (0.4) 139.9 (6.2) 33.9 (6.3) 17.2 (2.4) 62.1 (7.2) 9.7% 34.1% 44.1% 12.2%
  2011 652 (630) 9.6 (0.4) 138.7 (6.8) 34.0 (7.0) 17.6 (2.8) 60.8 (6.7)* 5.8% 39.1% 53.4% 1.7%
  2018 607 (597) 9.5 (0.4) 139.2 (6.3) 33.9 (6.5) 17.4 (2.5) 60.9 (6.2) 1.2% 17.0% 61.8% 20.1%
 15-y-olds
  2005 340 (334) 15.6 (0.4) 175.6 (7.1) 65.2 (12.8) 21.1 (3.7) 75.5 (9.4) 5.6% 32.9% 34.7% 26.8%
  2011 480 (430) 15.2 (0.6)* 173.2 (8.0)* 62.3 (12.0)* 20.7 (3.3) 73.1 (8.7)* 7.3% 38.1% 50.4% 4.2%
  2018 491 (444) 15.4 (0.4)** 175.1 (7.4)** 63.5 (11.3) 20.6 (3.0) 72.7 (6.9)* 2.9% 15.1% 56.4% 25.7%
GIRLS
 6-y-olds
  2011 510 (493) 6.6 (0.4) 120.9 (5.4) 23.8 (4.2) 16.2 (2.0) 54.4 (5.0) 5.3% 32.2% 60.6% 2.0%
  2018 427 (412) 6.5 (0.4) 120.7 (5.3) 23.3 (3.6) 15.9 (1.7)** 53.8 (4.3) 2.3% 15.9% 64.4% 17.3%
 9-y-olds
  2005 524 (518) 9.6 (0.4) 138.4 (6.8) 34.0 (7.1) 17.6 (2.7) 63.3 (7.7) 6.7% 38.4% 45.0% 9.9%
  2011 692 (679) 9.6 (0.4) 138.0 (6.5) 33.7 (6.8) 17.6 (2.7) 59.4 (6.5)* 7.4% 35.3% 54.9% 2.5%
  2018 613 (594) 9.5 (0.4) 138.3 (6.5) 33.8 (7.0) 17.5 (2.6) 59.6 (6.6)* 2.6% 20.7% 57.1% 19.6%.
 15-y-olds
  2005 360 (356) 15.6 (0.4) 165.6 (6.5) 58.0 (8.7) 21.1 (2.8) 73.3 (6.9) 8.3% 36.9% 34.7% 20.0%
  2011 489 (422) 15.2 (0.6)* 165.0 (6.2) 57.4 (9.5) 21.1 (3.1) 69.2 (6.7)* 6.1% 38.2% 53.0% 2.7%
  2018 497 (457) 15.4 (0.4)** 165.4 (6.1) 58.3 (9.9) 21.3 (3.3) 68.8 (6.9)* 3.6% 13.3% 58.8% 24.4%
  1. Abbreviations: yrs. years, BMI body mass index, WC waist circumference
  2. * Significantly different from 2005 (from 2011 in 6-y-olds) (p ≤ 0.049)
  3. ** Significantly different from 2005 & 2011 (p < 0.01)
  4. a n varies for the different anthropometric measurements and is lowest (in parenthesis) for WC except in 15-y-old boys (weight) and 15-y-old girls (BMI)
  5. b Based on parental education level (the parent with the highest attained education level), with low = primary school or lower secondary school, middle = high school (vocational or general studies), and high = University College or University degree. Note that parental education levels are based on self-reports in 2005 and 2018, and from linkage with registry data (Statistics Norway) in 2011