OBJECTIVE To provide a practical guidance for the analysis of N-of-1 trials by comparing four commonly used models. METHODS The four models, paired t-test, mixed effects model of difference, mixed effects model and meta-analysis of summary data were compared using a simulation study. The assumed 3-cycles and 4-cycles N-of-1 trials were set with sample sizes of 1, 3, 5, 10, 20 and 30 respectiv...

The Kids and Communities Count Farm Safety Lesson is a follow-up to our Kids Count Lesson that used the North American Guidelines for Children's Agricultural Tasks (NAGCAT) and was previously delivered to nearly 2,000 fifth-grade students in Hillsborough County, Florida. This year, the lesson was administered in two migrant schools and included a parent survey and a presentation of the lesson i...

Materials and Methods: This Randomized Control Trial consists of two experimental and control groups. The experimental group received intervention based on Health Action Model. Control group did not receive any intervention except participating in the current safety courses of company. The sample size was 270 worker who were randomly selected and divided into two experimental (n=135) and contro...

The importance of sample size evaluation in clinical trials is reviewed and a general method is presented from which specific equations are derived for sample size determination or the analysis of power for a wide variety os statistical procedures. The method is discussed and illustrated in relation to the t test, tests for proportions, tests of survival time, and tests for correlations as they...

Normatively, a statistical pairwise comparison is a function of the mean, standard deviation (SD), and sample size of the data. In our experiment, 203 undergraduates compared product pairs and judged their confidence thatone product was better than the other. We experimentally manipulated (within subjects) theaverage productratings, the number of raters (sample size), and the SD of the ratings....

One of the simplest and most widely used multiple comparison tests is the Bonferroni adjustment (test). It is applicable to the following situations: 1) Regardless of whether or not the sample sizes of each group are equal. 2) When the family of interest is the particular set of comparisons (not all pair-wise comparisons). We can easily obtain the results of the Bonferroni comparison by multipl...

introduction: the aim of the present study was to investigate the effectiveness of high-fiber diet on sexual hormones in obese and overweight female adolescents. methods: this randomized crossover clinical trial was conducted among 56 obese or overweight girls in shiraz, iran. all subjects were randomly divided into two groups. a list containing high (25 g/day green leafy vegetables or fresh fr...

Let (X\) Yi)',... ,(-Xn, Yny be a sample from a bivariate regular normal distribution with independent components. If r' is the sample correlation coefficient then it is known that Er = 0, varr' = + 0 ( n ~ f ) (1.1) n (see Cramer [4], § 27.8 and § 29.7). If {Xt} and {Yt} are independent time series then the variance of the sample correlation coefficient does not obey the formula (1.1). Let {et...

Tramadol is an opioid analgesic with the potential for addiction to other opioids, and one of the abused drugs in different countries including Iran. The present study was conducted to determine the prevalence and factors relating to tramadol abuse among higher education students in the city of Damghan in 2016. The present descriptive-analytical study enrolled 730 students from seven higher edu...