TSLP and Alzheimer disease: In some studies, it was possible to group AD subjects by mild, moderate, and severe severity according to predefined scales, and we found higher serum levels of TSLP in the active patient groups than in the control groups for each severity level (Mild: SMD = 1.15, 95% CI 0.14–2.16; moderate: SMD = 2.48, 95% CI 0.33–4.62 and severe: SMD = 8.28, 95% CI 4.82–11.74).