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Table 1 Baseline characteristics by study

From: Examining the impact of a province-wide physical education policy on secondary students’ physical activity as a natural experiment

Study 1: Survey data Comparison (PEI) (n = 2258) Intervention (Manitoba) (n = 33,619) P value
Age (years), mean ± SD 15.8 0.71 15.7 0.82 <.0001*
  n % n %  
Grade
 9 576 (25.5) 9070 (27.0) 0.0005
 10 591 (26.2) 9216 (27.4)  
 11 543 (24.0) 8438 (25.1)  
 12 548 (24.3) 6895 (20.5)  
Sex
 Female 1053 (46.6) 16,846 (50.1) <.0001
 Male 1094 (48.4) 16,773 (49.9)  
 Missing 111 (4.9) - -  
BMI status
 Healthy weight 1252 (55.4) 21,505 (64.0) <.0001
 Overweight or obese 468 (20.7) 7107 (21.1)  
 Missing 538 (23.8) 5007 (14.9)  
Study 2: Accelerometer data Comparison (Alberta) (n = 224) Intervention (Manitoba) (n = 447) P value
Age (years), mean ± SD 13.5 0.71 15.2 0.82 <.0001*
  n % n %  
Sex
 Female 133 (59.4) 239 (54.0) 0.1828
 Male 91 (40.6) 204 (46.1)  
BMI status
 Healthy weight 175 (78.1) 228 (51.0) <.0001
 Overweight or obese 49 (21.9) 61 (13.7)  
 Missing - - 158 (35.4)  
School location      0.0181
 Urban 137 (61.2) 314 (70.3)  
 Rural 87 (38.8) 133 (29.8)  
School Socioeconomic status      <.0001
 High 186 (83.0) 139 (31.1)  
 Low 38 (17.0) 308 (68.9)  
  1. Note: For accelerometer data, missing categories that constitute less than 5% of the sample were omitted from the table. Therefore, counts may not add up to their respective totals
  2. *Student’s t-test was used to compare across study condition
  3. Chi-square test was used to compare across province