# Alzbiomarker

## Welcome to AlzBiomarker!

For information about the development of this database, see Background, Methods, Glossary and FAQs.

This interactive resource organizes decades of data on biomarkers for Alzheimer's disease. Biomarker measurements from the cerebrospinal fluid and blood are curated from the primary literature and meta-analyzed. The database was developed in collaboration with Henrik Zetterberg and colleagues at the University of Gothenburg. We welcome your feedback and invite you to contact us at alzbiomarker@alzforum.org.

See below for links to each meta-analysis along with key statistics, such as p value and effect size -- a ratio of the mean biomarker concentration of one cohort over another (e.g. AD/control). View this page on a desktop, laptop, or tablet for a colorful, interactive graph of the results, plotted by effect size and z score.

Version 1.0, December 2015

231

Papers

1205

Cohorts

22

Biomarkers

30

Meta-Analyses

# Meta-Analyses

The graph, and the table below it, show key results from all meta-analyses. As the overall result, the effect size—a ratio of the mean biomarker concentration of one condition over another (e.g. AD/control)— is plotted against the z score, a statistic indicating how far away the observed ratio is from the null hypothesis of no difference. For example, a z score of 1.96 means that the observed ratio is 1.96 times larger than the standard error; it is equivalent to p=0.05. A z score of 3.89 is equivalent to p=0.0001. Customize the plot by deselecting group comparisons and/or biomarkers. The size of each circle reflects the total number of subjects in the meta-analysis. Mouse over the circle to learn more. In the table, click the arrows to sort each data column.

## Biomarkers:

Meta-Analysis | Effect Size | z score | p value | Number of Comparisons |
Number of Subjects |
---|---|---|---|---|

AD vs CTRL: Aβ38 (CSF) | Effect Size: 0.992 | z score | p value: z = 0.14 | p = 0.891 | Number of Comparisons: 8 | Number of Subjects: AD N=251, CTRL N=195 |

AD vs CTRL: Aβ40 (CSF) | Effect Size: 0.945 | z score | p value: z = 2.35 | p = 0.019 | Number of Comparisons: 25 | Number of Subjects: AD N=1079, CTRL N=784 |

AD vs CTRL: Aβ40 (Plasma) | Effect Size: 1.044 | z score | p value: z = 1.38 | p = 0.167 | Number of Comparisons: 21 | Number of Subjects: AD N=1661, CTRL N=3668 |

AD vs CTRL: Aβ42 (CSF) | Effect Size: 0.561 | z score | p value: z = 41.16 | p <0.0001 | Number of Comparisons: 142 | Number of Subjects: AD N=9949, CTRL N=6841 |

AD vs CTRL: Aβ42 (Plasma) | Effect Size: 1.040 | z score | p value: z = 0.99 | p = 0.321 | Number of Comparisons: 22 | Number of Subjects: AD N=1872, CTRL N=3855 |

AD vs CTRL: GFAP (CSF) | Effect Size: 1.119 | z score | p value: z = 0.34 | p = 0.736 | Number of Comparisons: 2 | Number of Subjects: AD N=59, CTRL N=39 |

AD vs CTRL: MCP-1 (CSF) | Effect Size: 1.121 | z score | p value: z = 4.23 | p <0.0001 | Number of Comparisons: 3 | Number of Subjects: AD N=59, CTRL N=59 |

AD vs CTRL: MCP-1 (Plasma and Serum) | Effect Size: 0.999 | z score | p value: z = 0.02 | p = 0.986 | Number of Comparisons: 6 | Number of Subjects: AD N=540, CTRL N=344 |

AD vs CTRL: NFL (CSF) | Effect Size: 2.351 | z score | p value: z = 7.86 | p <0.0001 | Number of Comparisons: 9 | Number of Subjects: AD N=245, CTRL N=292 |

AD vs CTRL: NSE (CSF) | Effect Size: 1.470 | z score | p value: z = 2.47 | p = 0.014 | Number of Comparisons: 7 | Number of Subjects: AD N=258, CTRL N=160 |

AD vs CTRL: NSE (Plasma and Serum) | Effect Size: 0.999 | z score | p value: z = 0.01 | p = 0.992 | Number of Comparisons: 3 | Number of Subjects: AD N=102, CTRL N=97 |

AD vs CTRL: VLP-1 (CSF) | Effect Size: 1.457 | z score | p value: z = 6.90 | p <0.0001 | Number of Comparisons: 4 | Number of Subjects: AD N=252, CTRL N=486 |

AD vs CTRL: YKL-40 (CSF) | Effect Size: 1.285 | z score | p value: z = 10.77 | p <0.0001 | Number of Comparisons: 6 | Number of Subjects: AD N=298, CTRL N=330 |

AD vs CTRL: YKL-40 (Plasma) | Effect Size: 1.950 | z score | p value: z = 1.93 | p = 0.053 | Number of Comparisons: 3 | Number of Subjects: AD N=155, CTRL N=233 |

AD vs CTRL: albumin ratio (CSF/Serum and/or Plasma) | Effect Size: 1.100 | z score | p value: z = 2.11 | p = 0.035 | Number of Comparisons: 20 | Number of Subjects: AD N=854, CTRL N=441 |

AD vs CTRL: hFABP (CSF) | Effect Size: 1.394 | z score | p value: z = 5.63 | p <0.0001 | Number of Comparisons: 5 | Number of Subjects: AD N=285, CTRL N=297 |

AD vs CTRL: hFABP (Plasma and Serum) | Effect Size: 1.049 | z score | p value: z = 0.40 | p = 0.692 | Number of Comparisons: 2 | Number of Subjects: AD N=55, CTRL N=74 |

AD vs CTRL: sAPPα (CSF) | Effect Size: 1.032 | z score | p value: z = 0.59 | p = 0.554 | Number of Comparisons: 9 | Number of Subjects: AD N=572, CTRL N=415 |

AD vs CTRL: sAPPβ (CSF) | Effect Size: 1.018 | z score | p value: z = 0.52 | p = 0.605 | Number of Comparisons: 10 | Number of Subjects: AD N=631, CTRL N=439 |

AD vs CTRL: tau-phospho (CSF) | Effect Size: 1.882 | z score | p value: z = 25.86 | p <0.0001 | Number of Comparisons: 96 | Number of Subjects: AD N=7498, CTRL N=5126 |

AD vs CTRL: tau-total (CSF) | Effect Size: 2.535 | z score | p value: z = 45.40 | p <0.0001 | Number of Comparisons: 164 | Number of Subjects: AD N=11341, CTRL N=7086 |

AD vs CTRL: tau-total (Plasma) | Effect Size: 1.946 | z score | p value: z = 2.36 | p = 0.018 | Number of Comparisons: 6 | Number of Subjects: AD N=271, CTRL N=394 |

MCI-AD vs MCI-Stable: Aβ40 (CSF) | Effect Size: 0.984 | z score | p value: z = 0.37 | p = 0.715 | Number of Comparisons: 3 | Number of Subjects: MCI-AD N=152, MCI-Stable N=189 |

MCI-AD vs MCI-Stable: Aβ40 (Plasma) | Effect Size: 1.066 | z score | p value: z = 3.72 | p <0.0001 | Number of Comparisons: 3 | Number of Subjects: MCI-AD N=308, MCI-Stable N=379 |

MCI-AD vs MCI-Stable: Aβ42 (CSF) | Effect Size: 0.674 | z score | p value: z = 10.32 | p <0.0001 | Number of Comparisons: 12 | Number of Subjects: MCI-AD N=352, MCI-Stable N=610 |

MCI-AD vs MCI-Stable: Aβ42 (Plasma) | Effect Size: 0.807 | z score | p value: z = 0.99 | p = 0.324 | Number of Comparisons: 3 | Number of Subjects: MCI-AD N=308, MCI-Stable N=379 |

MCI-AD vs MCI-Stable: sAPPα (CSF) | Effect Size: 1.091 | z score | p value: z = 1.30 | p = 0.195 | Number of Comparisons: 3 | Number of Subjects: MCI-AD N=118, MCI-Stable N=169 |

MCI-AD vs MCI-Stable: sAPPβ (CSF) | Effect Size: 1.055 | z score | p value: z = 0.55 | p = 0.586 | Number of Comparisons: 3 | Number of Subjects: MCI-AD N=118, MCI-Stable N=169 |

MCI-AD vs MCI-Stable: tau-phospho (CSF) | Effect Size: 1.719 | z score | p value: z = 6.50 | p <0.0001 | Number of Comparisons: 9 | Number of Subjects: MCI-AD N=251, MCI-Stable N=501 |

MCI-AD vs MCI-Stable: tau-total (CSF) | Effect Size: 1.758 | z score | p value: z = 15.53 | p <0.0001 | Number of Comparisons: 12 | Number of Subjects: MCI-AD N=307, MCI-Stable N=570 |

# Further Reading

## News

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- TREM2 Goes Up in Spinal Fluid in Early Alzheimer’s
- Large Grant for Chronic Traumatic Encephalopathy Biomarker Study
- Countdown to Alzheimer’s: Can Fluid Biomarkers Predict Progression?