Conicity Index as an Anthropometric Index of Central Obesity in the Prediction of Adult Bronchial Asthma; Correlation with Fractional Exhaled Nitrous Oxide Tests
Keywords:Asthma, obesity, conicity index, fractional exhaled nitric oxide test.
Obesity and bronchial asthma (BA) are two major health concerns. These entities have been further
established by several meta-analyses. Still, these analyses denote to ‘‘general-obesity’’, that classically
measured via body mass index (BMI), which is a broad measure unable to distinguish between lean musclebulk and body fats. Thus, other indices, should applied like waist perimeter, waist/hip ratio, and conicity
index (CI), which are also reasonable, and normalized easily. Sufficient studies on the BA association with
CI are lacking up till now. Our work was designed based on the theory that obesity worsens BA symptoms,
aiming to evaluate the asthma relationships and CI.
Methodology: This is an observational-study conducted on 410 asthmatics consulting outpatient-respiratoryclinic. They were diagnosed by pulmonologists, then referred for spirometric pulmonary functions (SPF)
and fractional exhaled nitric oxide (FENO) tests. Patients’ weight, height and BMI were measured and
accordingly divided into two-classes ‘‘nonobese and obese’’. The X2-test was applied to analyze the
associations among qualitative parameters. Level of significant acceptance was 5%, and the analyses had
completed by using the SPSS package.
Results: Mean±SD of weight, height, and BMI were 80.9±15.4, 1.64±1.6, and 30.8±5.4, respectively. AObindices were 96.2±14.3, 107.1±10.6, 0.98±0.9 and1.25±0.1 for waist, hip, W/HR, and CI respectively. The
mean FENO-measures were 43.8 ppb. There was a significant variation in the means of PEF and FEV1/FVC
only, although the FENO-tests were equivalent between the sexes.There was a strong association between
CI with increasing age. The CI had a weak non-significant association with increasing FENO-results.
Conclusion: The conicity index as an anthropometric index of central obesity is not associated with the
FENO test among adult asthmatic patients. There was non-significant variation between obese and nonobese
groups. The CI is not useful in the prediction of adult BA.
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