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. 2022 Jan 18;8:781333. doi: 10.3389/fnut.2021.781333

Figure 2.

Figure 2

Forest plot of the meta-analysis on comparison of serum vitamin levels between H. pylori - positive and H. pylori - negative patients (n1: number of H. pylori – positive patients; n2: number of H. pylori – negative patients); H. pylori – positive patients had lower serum vitamin B12 levels than H. pylori – negative patients (SMD = –0.30; 95% CI: −0.53 – −0.08; P < 0.001; I2 = 71.4%); H. pylori – positive patients had lower serum folate levels than H. pylori-negative patients (SMD = −0.69; 95% CI: −1.34 – −0.04; P < 0.001; I2 = 95.8%); H. pylori – positive patients had lower serum vitamin C levels than H. pylori-negative patients (SMD = −0.37; 95% CI: −0.57 – −0.18; P < 0.001; I2 = 87.9%); H. pylori – positive patients had lower serum vitamin D levels than H. pylori-negative patients (SMD = −0.34; 95% CI: −0.49 – −0.18; P < 0.001; I2 = 95.0%).