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Table 3 Baseline sociodemographic characteristics of students, overall and by assigned strategy

From: PRALIMAP: study protocol for a high school-based, factorial cluster randomised interventional trial of three overweight and obesity prevention strategies

  Overall Educational
strategy
Screening
strategy
Environmental
strategy
   No Yes No Yes No Yes
  N = 5,458 N = 2,483 N = 2,975 N = 2,771 N = 2,687 N = 2,794 N = 2,664
  % % % % % % %
Mean age (years) 15.8* 15.7¥ 15.7¥ 15.7¥ 15.7¥ 15.7¥ 15.7¥
Gender (% girls) 52.9 56.8 53.6 56.5 53.6 54.8 55.4
General and technological course 69.7 78.6 83.3 77.9 84.5 78.9 83.5
School boarding status        
   Non-boarder 22.6 21.9 21.4 21.1 22.1 24.8 18.2
   Half-boarder 68.2 70.4 68.4 68.5 70.1 66.1 72.7
   Full Boarder 9.2 7.7 10.3 10.4 7.8 9.1 9.1
Schooling        
   Classic 61.4 64.9 67.2 65.8 66.6 65.2 67.1
   Advance placement at school 2.1 2.2 2.8 2.3 2.8 2.6 2.5
   Late placement at school 36.4 32.9 29.9 31.9 30.7 32.2 30.4
Residence (Rural) 47.0 47.1 50.3 54.3 43.3 46.2 51.6
Social and professional class of the family head        
   Farmers, shopkeepers, craftsmen, managers 7.3 7.8 8.3 8.6 7.6 7.2 9.0
   Executives 12.6 14.4 13.7 11.1 17.0 15.8 12.1
   Intermediate jobs 18.5 18.5 21.0 17.7 22.1 20.9 18.8
   Employees, workers 50.1 50.4 46.2 52.3 43.9 46.4 49.9
   Inactive (unemployed, retired) 11.4 8.9 10.8 10.4 9.5 9.7 10.2
Parents occupation**        
   Neither of the 2 parents works 7.0 5.2 6.5 6.6 5.1 5.0 6.8
   One of the 2 parents works 31.3 29.8 30.2 31.0 29.0 28.8 31.2
   The 2 parents work 61.7 65.1 63.4 62.4 65.9 66.2 62.0
Family income level**        
   Low 6.9 6.3 6.7 7.5 5.5 6.0 7.0
   Average 33.3 33.6 34.4 33.9 34.2 34.4 33.7
   High 59.8 60.1 58.9 58.6 60.3 59.6 59.3
Parental physical activity level**        
   Low 54.9 53.1 53.1 54.3 51.8 52.7 53.4
   Moderate 3.8 4.4 3.3 4.2 3.4 3.8 3.8
   High 41.2 42.5 43.6 41.5 44.7 43.4 42.8
Parents considered overweight** 39.1 40.0 40.2 40.1 40.2 40.4 39.8
  1. ¶ Overall baseline characteristic parameters are estimated according to stratification and cluster design
  2. ¥ Standard Deviation = 0.7
  3. * Standard Error of the Mean = 0.02
  4. ** Declared by adolescents