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Table 2 Results from the univariable, full model and stepwise procedure with bias-corrected and accelerated-bootstrap confidence interval (BCa) in overweight|obesity

From: Overweight and obesity by school socioeconomic composition and adolescent socioeconomic status: a school-based study

Variables

Univariable Analysis

Full Model without interaction with BCa

Full Model with interaction and BCa

Stepwise Model with BCa

Age

0.89 [0.77;1.02]

0.80** [0.68;0.95]

0.81* [0.70;0.97]

0.81* [0.69;0.98]

Sex

 Girls (ref.)

    

 Boys

1.29 [0.89;1.87]

1.53* [1.03;2.29]

1.54* [1.01;2.34]

1.53 [1.00;2.35]

Adolescent SES

 Low (ref.)

    

 Medium

0.76 [0.47;1.21]

0.97 [0.58;1.62]

1.78 [0.83;3.91]

1.78 [0.71;3.51]

 High

0.59* [0.37;0.93]

0.94 [0.55;1.59]

2.37 [1.00;5.52]

2.38 [0.99;5.54]

School SEC

 Low (ref.)

    

 Medium

0.74 [0.49;1.12]

0.58 [0.33;1.01]

1.11 [0.54;2.32]

1.15 [0.56;2.28]

 High

0.38*** [0.22;0.64]

0.34** [0.17;0.68]

1.14 [0.31;3.52]

1.24 [0.27;3.29]

School Lunch

 Outside of school (ref.)

    

 At school

0.70 [0.47;1.01]

1.08 [0.66;1.76]

1.16 [0.69;1.91]

–

Physical Activity

 Low PA (ref.)

    

 Medium PA

0.82 [0.55;1.24]

1.01 [0.65;1.6]

1.03 [0.65;1.65]

1.02 [0.64;1.65]

 High PA

0.48* [0.22;0.95]

0.44* [0.19;0.93]

0.42* [0.18;0.95]

0.41* [0.17;0.90]

Household Composition

 Live with both parents (ref.)

    

 Do not live with both parents

1.13 [0.77;1.66]

1.01 [0.66;1.52]

1.01 [0.65;1.58]

–

 Number of Siblings (M, SD)

1.14* [1.02;1.27]

1.10 [0.97;1.25]

1.12 [0.98;1.28]

1.11 [0.97;1.26]

Adolescent SES x School SEC

 Low Adolescent SES x Low School SEC

  

ref.

ref.

 Medium Adolescent SES x Medium School SEC

  

0.43 [0.15;1.30]

0.43 [0.15;1.36]

 High Adolescent SES x Medium School SEC

  

0.15** [0.05;0.56]

0.16** [0.04;0.50]

 Medium Adolescent SES x High-School SEC

  

0.08* [0.00;0.62]

0.08* [0.00;0.70]

 High Adolescent SES x High-School SEC

  

0.18* [0.04;0.89]

0.18* [0.04;0.82]

Aikake Information Criterion

 

729

718.52

714.9

Sensitivity

 

73.6%

79.3%

79.3%

Specificity

 

50.9%

50.1%

50.9%

Area Under Curve

 

0.653

0.691

0.690

  1. Note. Outcome variable: overweight or obesity; Ref.: Reference category; *p-value:0.05, **p-value:0.01, ***p-value:0.001