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. Author manuscript; available in PMC: 2009 Jan 21.
Published in final edited form as: N Engl J Med. 2008 Apr 9;358(16):1682–1691. doi: 10.1056/NEJMoa0708801

Figure 2. Serum YKL-40 Level, Asthma Prevalence, and Lung-Function Measures in Hutterites, According to −131C→G Genotype (rs4950928).

Figure 2

All measures differed significantly among the three genotypes. Panel A shows the mean natural-log–transformed serum YKL-40 levels (P = 1.1×10−13 by the general two-allele model). Panel B shows asthma prevalences among 554 Hutterites (P = 0.047 by the case–control quasi-likelihood test). Panel C shows the mean percent of the predicted forced expiratory volume in 1 second (FEV1) (P = 0.046 by the general two-allele model). Panel D shows the mean ratio of FEV1 to forced vital capacity (FVC) (P = 0.002 by the general two-allele model).