Notes:
a  Last 8 studies were included in a previously published meta-analysis study;14
b  quality was scored and rated independently using the American Dietetic Association Quality Criteria Checklist
c  this conference abstract was not rated due to insufficient information.
Abbreviations: BMI, body mass index; CI, confidence interval; FFQ, food frequency questionnaire; OR, odds ratio; PCA, principal component analysis; FVC, forced vital capacity; FEV1, forced expiratory volume in one second; IL, interleukin; RR, relative risk; RRR, reduced rank regression.