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Table 1 Physical activity and lifestyle of Balearic Islands adolescents stratified by sex and age

From: Association between sedentary behaviour and socioeconomic factors, diet and lifestyle among the Balearic Islands adolescents

   Age group
   Total 12-13 14-15 16-17 P
Boys n 939 240 445 254  
  Physical activity 1 (%)†      
   Inactive 22.0 17.6 23.2 24.0 NS
   Active 78.0 82.4 76.8 76.0  
  Physical activity practice      
 Moderate      
    Did not engage (%)† 8.9 7.2 7.6 12.8 *
    Mean duration (min/week)‡ 215.1 ± 250.5 264.9 ± 330.2a 192.6 ± 200.7a 208.4 ± 237.7 **
    Time spent (% total)† 35.7 ± 28.6 35.2 ± 24.6 35.9 ± 27.3 35.7 ± 28.6 NS
 Vigorous      
    Did not engage (%)† 11.0 8.0 11.1 13.6 NS
    Mean duration (min/week)‡ 502.8 ± 401.4 558.7 ± 454.2 486.6 ± 387.3 477.8 ± 367.6 NS
    Time spent (%)† 64.3 ± 27.0 64.8 ± 24.6 64.1 ± 27.3 64.3 ± 28.6 NS
  Media-screen time (%)†      
   <2 h/d 17.6 21.2 16.0 17.1 *
   2-4 h/d 42.6 47.7 41.1 40.2  
   ≥4 h/d 39.8 31.1 42.8 42.7  
  Homework time (%)†      
   <1 h/d 16.3 13.8 19.1 13.8 NS
   1-3 h/d 69.7 69.7 69.3 70.4  
   ≥3 h/d 14.0 16.5 11.6 15.8  
  Sleep time (%)†      
   <7 h/d 9.5 7.1 9.2 12.2 NS
   ≥7 h/d 90.5 92.9 90.8 87.8  
Girls n 1022 255 503 264  
  Physical activity 1 (%)†      
   Inactive 50.8 41.4 51.9 57.3 **
   Active 49.2 58.6 48.1 42.7  
  Physical activity practice      
 Moderate      
    Did not engage (%)† 12.7 7.9 11.0 20.0 ***
    Mean duration (min/week)‡ 169.1 ± 165.7 188.5 ± 210.5 164.1 ± 147.1 158.8 ± 146.1 *
    Time spent (% total)† 50.4 ± 33.7 47.2 ± 31.6 52.0 ± 33.7 50.6 ± 35.8 NS
 Vigorous      
    Did not engage (%)† 28.4 20.3 29.4 33.8 **
    Mean duration (min/week)‡ 354.3 ± 356.2 422.6 ± 470.4a,b 338.9 ± 313.8a 308.5 ± 267.2b **
    Time spent (%)† 49.6 ± 33.7 52.8 ± 31.6 48.0 ± 33.7 49.4 ± 35.8 NS
  Media-screen time (%)†      
   <2 h/d 21.2 28.0 17.5 21.6 **
   2-4 h/d 38.7 41.0 36.3 40.9  
   ≥4 h/d 40.2 31.0 46.2 37.5  
  Homework time (%)†      
   <1 h/d 8.3 8.9 10.0 4.3 **
   1-3 h/d 66.0 68.5 67.6 60.9  
   ≥3 h/d 25.7 22.6 22.4 34.8  
  Sleep time (%)†      
   <7 h/d 8.9 3.1 9.7 12.9 ***
   ≥7 h/d 91.1 96.9 90.3 87.1  
  1. 1Physical inactivity was defined as <300 min/week of moderate and vigorous physical activity [7]. Values are mean ± SD and%. Significant differences between age groups by: †χ 2 and ‡ANOVA: *p < 0.05; **p < 0.01; ***p < 0.001. NS: not significant. Significant differences between pairs of means by Bonferroni’s post-hoc test (P < 0.05): a‘12-13’ vs. ‘14-15’; b‘12-13’ vs. ‘16-17’.