Table 6 Multilevel linear regression model of body mass index Z-score using the IOTF classification system, in the analytical dataset, El Salvador, 2015/2016

Intercept

0.41(0.38, 0.43)^a

1.51 (1.22, 1.41)^a

1.36 (1.26, 1.45)^a

1.36 (1.18, 1.54)^a

 Sex (ref.: girls)

0.040 (0.027, 0.054)^a

0.040 (0.026, 0.053)^a

0.040 (0.026, 0.053)^a

 Age

−0.15 (−0.16, − 0.13)^a

−0.14 (−0.15, −0.12)^a

−0.14 (− 0.15, − 0.12)^a

 Location (ref.: rural)

0.20 (0.18, 0.23)^a

0.20 (0.17, 0.22)^a

 Type (ref.: public)

0.28 (0.25, 0.32)^a

0.28 (0.25, 0.31)^a

 Human development index (ref.: 0.68 or more)

0.11 (0.070, 0.15)^a

 Logarithm of population size

−0.0068 (−0.024, 0.010)^b

 Student level variance

1.290

1.285

1.286

1.286

 School/municipal level variance

0.0780

0.0730

0.0526

0.0525

 Municipal level variance

0.0225

0.0213

0.0104

0.0076

 Student ICC

92.7%

93.1%

95.3%

95.5%

 School ICC

5.6%

5.2%

4.6%

4.4%

 Municipal ICC

1.6%

1.5%

0.7%

0.5%

 Deviance

3999.86 (Reference)

628.44

1351.05

1389.26

P-value

0.0000

0.0000

0.0000

0.0000