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Milad Sawiris 《Journal of applied statistics》2000,27(3):363-371
Given a set of n elements or observations that form a continuous variable, it is required to divide their distribution into k homogenous groups where k > 2, and the purpose is to minimize the within-groups variance. This paper investigates procedures for such a division and shows how to find the boundaries separating the groups. 相似文献
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Vahideh Moghaddam Hosseini Milad Nazarzadeh Shayesteh Jahanfar 《Women and birth : journal of the Australian College of Midwives》2018,31(4):254-262
Introduction
Fear of childbirth is a problematic mental health issue during pregnancy. But, effective interventions to reduce this problem are not well understood.Objectives
To examine effective interventions for reducing fear of childbirth.Material and methods
The Cochrane Central Register of Controlled Trials, PubMed, Embase and PsycINFO were searched since inception till September 2017 without any restriction. Randomised controlled trials and quasi-randomised controlled trials comparing interventions for treatment of fear of childbirth were included. The standardized mean differences were pooled using random and fixed effect models. The heterogeneity was determined using the Cochran’s test and I2 index and was further explored in meta-regression model and subgroup analyses.Results
Ten studies inclusive of 3984 participants were included in the meta-analysis (2 quasi-randomized and 8 randomized clinical trials). Eight studies investigated education and two studies investigated hypnosis-based intervention. The pooled standardized mean differences of fear for the education intervention and hypnosis group in comparison with control group were ?0.46 (95% CI ?0.73 to ?0.19) and ?0.22 (95% CI ?0.34 to ?0.10), respectively.Conclusions
Both types of interventions were effective in reducing fear of childbirth; however our pooled results revealed that educational interventions may reduce fear with double the effect of hypnosis. Further large scale randomized clinical trials and individual patient data meta-analysis are warranted for assessing the association. 相似文献
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