Sample Size

Publication Title: 
The Journal of Pain: Official Journal of the American Pain Society

Bee venom (BV) acupuncture (BVA) involves injecting diluted BV into acupoints and is used for arthritis, pain, and rheumatoid diseases. The objective of this systematic review was to evaluate the evidence for the effectiveness of BVA in the treatment of musculoskeletal pain. Seventeen electronic databases were systematically searched up to September 2007 with no language restrictions. All randomized clinical trials (RCTs) of BVA for patients with musculoskeletal pain were considered for inclusion if they included placebo controls or were controlled against a comparator intervention.

Lee, Myeong Soo
Pittler, Max H.
Shin, Byung-Cheul
Kong, Jae Cheol
Ernst, Edzard
Publication Title: 
BMC complementary and alternative medicine

BACKGROUND: Estimating a realistic effect size is an important issue in the planning of clinical studies of complementary and alternative medicine therapies. When a minimally important difference is not available, researchers may estimate effect size using the published literature. This evidence-based effect size estimation may be used to produce a range of empirically-informed effect size and consequent sample size estimates. We provide an illustration of deriving plausible effect size ranges for a study of acupuncture in the relief of post-chemotherapy fatigue in breast cancer patients.

Johnston, Michael F.
Hays, Ron D.
Hui, Ka-Kit
Publication Title: 
Mechanisms of Ageing and Development

Accessible and readily utilized software, tables and approximation formulae have been developed to estimate power and sample size for studies of time to event (survival times) when the survival times are assumed to be exponential. These methods can markedly misestimate power when the distribution is Weibull and not exponential. The Weibull distribution with increasing hazard is common in aging research, especially when the whole life span of the subjects is of interest.

Heo, M.
Faith, M. S.
Allison, D. B.
Publication Title: 

The exceptional longevity of centenarians is due in part to inherited genetic factors, as deduced from data that show that first degree relatives of centenarians live longer and have reduced overall mortality. In recent years, a number of groups have performed genetic association studies on long-living individuals (LLI) and young controls to identify alleles that are either positively or negatively selected in the centenarian population as consequence of a demographic pressure. Many of the reported studies have shown genetic loci associated with longevity.

Novelli, Valeria
Viviani Anselmi, Chiara
Roncarati, Roberta
Guffanti, Guia
Malovini, Alberto
Piluso, Giulio
Puca, Annibale Alessandro
Publication Title: 

In the Georgia Centenarian Study (Poon et al., Exceptional Longevity, 2006), centenarian cases and young controls are classified according to three categories (age, ethnic origin, and single nucleotide polymorphisms [SNPs] of candidate longevity genes), where each factor has two possible levels. Here we provide methodologies to determine the minimum sample size needed to detect dependence in 2 x 2 x 2 tables based on Fisher's exact test evaluated exactly or by Markov chain Monte Carlo (MCMC), assuming only the case total L and the control total N are known.

Dai, Jianliang
Li, Li
Kim, Sangkyu
Kimball, Beth
Jazwinski, S. Michal
Arnold, Jonathan
Georgia Centenarian Study
Publication Title: 
Psychological Medicine

BACKGROUND: It has been well established that both genes and non-shared environment contribute substantially to the underlying aetiology of major depressive disorder (MDD). A comprehensive overview of genetic research in MDD is presented. Method Papers were retrieved from PubMed up to December 2011, using many keywords including: depression, major depressive disorder, genetics, rare variants, gene-environment, whole genome, epigenetics, and specific candidate genes and variants. These were combined in a variety of permutations.

Cohen-Woods, S.
Craig, I. W.
McGuffin, P.
Publication Title: 
Journal of Epidemiology and Community Health

During the past two decades, research concerned with the aetiology of psychopathology has generally progressed along two separate paths: investigations that have characterised the roles played by environmental determinants such as childhood adversity in the development of psychopathology, and those that have focused on neurobiological processes involving genetic and intracellular pathways.

El-Sayed, Abdulrahman M.
Koenen, Karestan C.
Galea, Sandro
Publication Title: 
BMC public health

BACKGROUND: While families headed by same-sex couples have achieved greater public visibility in recent years, there are still many challenges for these families in dealing with legal and community contexts that are not supportive of same-sex relationships. The Work, Love, Play study is a large longitudinal study of same-sex parents. It aims to investigate many facets of family life among this sample and examine how they change over time.

Power, Jennifer J.
Perlesz, Amaryll
Schofield, Margot J.
Pitts, Marian K.
Brown, Rhonda
McNair, Ruth
Barrett, Anna
Bickerdike, Andrew
Publication Title: 
Journal of Affective Disorders

BACKGROUND: The aim of this study was to identify romantic relationship characteristics, emotional and personality aspects and social adjustment in subjects with pathological jealousy (PJ) and to compare them to control group. METHODS: The participants, 32 individuals with PJ and 31 healthy volunteers completed measures of jealousy intensity, attachment type, love and relationship styles, personality, impulsivity, aggressiveness and social adjustment. Socio-demographic profiles were also obtained.

Costa, Andrea Lorenada
Sophia, Eglacy C.
Sanches, CÌntia
Tavares, Hermano
Zilberman, Monica L.
Publication Title: 
Twin Research: The Official Journal of the International Society for Twin Studies

Twin research offers the greatest power for the genetic analysis of complex multifactorial traits and diseases in humans. Modern twin analyses extend beyond the classical twin study for estimating the heritability of a trait. The human genome project can fulfil its promises only after functional characterisation of single genes in the context of genetic background and environment. Twin research can make a major contribution in that regard. Twin research is greatly facilitated by the willingness, motivation, cooperation, and generosity of the participants and their families.

Busjahn, Andreas


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