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. Author manuscript; available in PMC: 2017 Sep 1.
Published in final edited form as: Pediatr Pulmonol. 2016 Jan 15;51(9):893–900. doi: 10.1002/ppul.23381

TABLE 5.

Sex-Stratified Contribution of Neck Circumference to the Relationship Between Body Mass Index Percentile and Outcomes

Sex Asthma outcome Model with NC alone (r2) Model with BMI percentile alone (r2) Model with BMI percentile +NC (r2) % variability in outcome attributable to NC (P-value)1 Cohen’s f2 effect size
Female ACT2 0.081 0.142 0.147 0.5% (0.60) <0.01
ITG composite 0.056 0.096 0.099 0.3% (0.68) <0.01
ITG functional 0.046 0.093 0.094 0.1% (0.80) <0.01
ITG daytime 0.068 0.039 0.070 3.2% (0.19) 0.033
ITG nighttime 0.008 0.073 0.082 0.9% (0.49) 0.01
Male ACT2 0.096 0.021 0.096 7.5% (0.029) 0.083
ITG composite 0.081 0.004 0.085 8.1% (0.028) 0.093
ITG functional 0.081 0.017 0.081 6.4% (0.049) 0.073
ITG daytime 0.050 0.011 0.050 3.9% (0.13) 0.043
ITG nighttime 0.052 0.002 0.075 7.3% (0.037) 0.083

BMI, body mass index; NC, neck circumference; ACT, asthma control test; ITG, integrated therapeutics group’s child asthma short form.

1

Likelihood-ratio P-value shown.

2

Analyses performed on square-transformed data.

3

By convention, a Cohen’s f2 effect size of 0.02, 0.15, and 0.35 are considered small, medium and large, respectively.