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# Table 1 References for sample size calculation

Title Primer Concepts Sample size ROT Simulation
Some practical guidelines for effective sample size determination [2]
Sample size calculations for the design of health studies: a review of key concepts for non-statisticians [1]
Sample size calculations: basic principles and common pitfalls [15]
Sample size: how many participants do I need in my research? [3]
Using effect size–or why the P value is not enough [8]
Statistics and ethics: some advice for young statisticians [16]
Separated at birth: statisticians, social scientists and causality in health services research [17]
Reporting the results of epidemiological studies [9]
Surgical mortality as an indicator of hospital quality: the problem with small sample size [18]
Do multiple outcome measures require p-value adjustment? [11]
The problem of multiple inference in studies designed to generate hypothesis [19]
Understanding power and rules of thumb for determining sample sizes [20]
Statistical rules of thumb [21]
A suggested statistical procedure for estimating the minimum sample size required for a complex cross-sectional study [22]    Complex cross-sectional
A simple method of sample size calculation for liner and logistic regression [23]    Regression
How many subjects does it take to do a regression analysis [10]    Regression
Sample size determination in logistic regression [24]    Logistic regression
A simulation study of the number of events per variable in a logistic regressions analysis [25]    Logistic regression
Power and sample size calculations for studies involving linear regression [26]    Linear regression
How to calculate sample size in randomized controlled trial? [27]    Randomised control trial
Sufficient sample sizes for multilevel modelling [28]    Multilevel
Sample size considerations for multilevel surveys [29]    Multilevel
Sample size and accuracy of estimates in multilevel models: new simulation results [30]    Multilevel
Robustness issues in multilevel regression analysis [31]    Multilevel
1. Primer =  basic paper on the concepts around sample size determination, provides a basic but important understanding. Concepts =  provides a more detailed explanation around specific aspects of sample size calculation. Sample size =  these papers provide examples of sample size calculation for specific analysis types. ROT =  these papers provide sample size ‘rules of thumb’ for one or more type of analysis. Simulation =  these papers report the results of sample size simulation for various types of analysis