The current state of international research on the effectiveness of school nurses in promoting the health of children and adolescents: An overview of reviews

School nurses are engaging worldwide to promote and protect children's health. Many researchers who examined the effectiveness of the school nurse criticized the inadequate methodology employed in many of the studies. We therefore carried out an evaluation on the effectiveness of school nurses based on a rigorous methodological approach. In this overview of reviews we performed an electronic databank search and global research results on the effectiveness of school nurses were sought. We identified 1,494 records through database search. Abstracts and full texts were screened and summarized using the dual control principle. We summarized the aspects of quality criteria as well as the significance of the effectiveness of the school nurse. In the first step, k = 16 systematic reviews were summarized and evaluated following the AMSTAR-2 guidelines. In a second step, j = 357 primary studies included in these k = 16 reviews were summarized and assessed following the GRADE guidelines. Research results on the effectiveness of school nurses show that school nurses play a key role in improving the health of children with asthma (j = 6) and diabetes (j = 2), results on combating obesity are less certain (j = 6). The quality of identified reviews is mostly very low with only six studies of medium quality, of which one identified as a meta-analysis. A total of j = 289 primary studies were identified. Approximately 25% (j = 74) of identified primary studies were either randomized controlled trials (RCT) or observational studies, of which roughly 20% (j = 16) had a low risk of bias. Studies with physiological variables such as blood glucose or asthma labeling led to higher quality results. This paper represents an initial contribution and recommends further evaluation of the effectiveness of school nurses, particularly in the areas of mental health or children from low socioeconomic backgrounds. The general lack of quality standards in school nursing research should be integrated into the scientific discourse of school nursing researchers to provide robust evidence for policy planners and researchers.