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Table 1 Characteristics of the sample of 15-19 y, Tunisian adolescents (n = 2870).

From: Blood pressure and associated factors in a North African adolescent population. a national cross-sectional study in Tunisia

   Boys   Girls  
Characteristics n1 Mean(s.e.)
or
%2
n1 Mean(s.e.)
or
%2
P-value3
  1294 51.0 1576 49.0  
Age (years)      
15-17 838 63.2 982 63.2 0.99
18-19 456 36.8 594 36.8  
Area      
Urban 707 62.3 825 62.4 0.93
Rural 587 37.7 751 37.6  
Socio-economic factors
Household's economic level
Low 526 38.4 645 37.4  
Intermediate 427 32.1 552 36.0 0.14
High 283 29.5 299 26.6  
Attending school 1292 69.1 1572 74.2 0.020
Behavioral factors
Proportion of low physical activity
1 st tertile (low) 562 46.2 283 20.0  
2 nd tertile (middle) 413 31.0 543 35.8 < 10-4
3 rd tertile (high) 319 22.8 750 44.3  
Perceived stress      
1 st tertile (low) 473 37.7 504 31.6  
2 nd tertile (middle) 474 35.9 566 36.0 0.0021
3 rd tertile (high) 341 26.4 500 32.4  
Anthropometric characteristics
Body Mass Index (kg/m2) 1294 20.9 (0.1) 1576 22.0 (0.1) < 10-4
No excess weight 1011 76.9 1161 72.9  
Overweight 218 17.9 337 22.3 0.085
Obesity 65 5.2 78 4.8  
Waist circumference (cm) 1287 75.7 (0.4) 1571 73.1 (0.3) < 10-4
1 st tertile 496 33.4 632 36.7  
2 nd tertile 433 35.3 468 31.7 0.14
3 rd tertile 358 31.3 471 31.7  
Blood pressure (BP) status
Systolic BP (mmHg) 1294 114.2 (0.4) 1576 110.9 (0.4) < 10-4
Diastolic BP (mmHg) 1294 68.1 (0.3) 1576 66.6 (0.4) < 10-3
Elevated BP 1294 46.1 1576 33.3 < 10-4
Hypertension 1294 4.3 1576 5.1 0.45
  1. 1-Number of subjects surveyed
  2. 2-Weighted mean (standard error) or proportion (accounting for unequal probabilities of selection and/or differential response rates)
  3. 3- Boys vs. girls (chi-square test for %, t-test for means)