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. 2010 Apr 20;171(10):1126–1133. doi: 10.1093/aje/kwq063

Figure 1.

Figure 1.

Unadjusted, untransformed means and standard deviations of A) blood lead, B) plasma procollagen type 1 amino-terminal peptide (PINP), and C) plasma C-terminal telopeptides of type 1 collagen (CTX) levels among amyotrophic lateral sclerosis (ALS) cases and controls, the Veterans with ALS and Lead Exposure study, United States, 2003–2007. P values were calculated after adjustment for age (as a continuous variable; age at diagnosis for cases and age at interview for controls)—A): P < 0.0001, B): P = 0.77, C): P < 0.0001.