The higher prevalence among refugees in Southern Sudan and IDP in Uganda could be due to ongoing feeling of insecurity among refugees community and also might be due to difference in instrument.
The differences in instruments and geographical isolation of players in different countries led to the development, from the last part of the 18th century onwards, of several different schools of clarinet playing.
Other sources of high heterogeneity may be differences in instruments used to define the outcome, differences in patient groups (i.e. different stage of cancer, or different timing of the intervention with respect to primary cancer treatment), or differences in control groups.
The variations of results and estimates of PMS from various studies could be due to limitations and differences in the definition of PMS, standards and methods of data collection, sampling technique, type of patient population studied and differences in instruments, symptom's patterns, the number of symptoms reported and the use of prospective or retrospective protocols.
But there were other, subtler differences in instrument design, though not so extreme as in original-instrument Baroque performances.
Although beyond the scope of this study, this has revealed, among other things, large differences in instrument performance, due primarily to differences in the optical precision they produce.
To assess between-group differences in instrument item scores, Mann Whitney U tests were used.
Both instruments are strongly correlated with a Pearson correlation coefficient of 0.88 [ 45], so the difference in the instruments is assumed to have no impact on the relative treatment effect.
This is an unusual finding that can't be fully explained by the difference in the instruments (classical versus traditional), playing method or intensity of the exercise.
Differences in reference instruments would not likely explain the greater measurement error reported by Tanner, given that their instrument undergoes a three-point and two-point calibrations check every few hours, similar to our reference instrument.
