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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