Although data are limited, differences in overweight and obesity by gender and age have been observed in The Gambia.
Since the inclusion period was limited, differences in the therapeutic management are unlikely to have influenced the survival.
However, a majority of studies have reported improved fusion rates, lower subsidence rates and radiolucency with PEEK versus Ti cages [ 42- 45], with one long-term study by Chen et al. reporting limited differences in the early postoperative period, but better maintenance of intervertebral height, cervical lordosis and clinical outcomes by PEEK cages in 7-year follow up [ 46].
A limiting difference in slump and J-Ring flow of 100 mm is recommended for similar concrete mixtures.
To limit differences between subjects in the basal temperature, SBF was recorded at a local skin temperature of 37 °C allowing for at least three minutes of stabilization.
All samples were sieved to isolate the fine-grained fraction (<63 μm) prior to analysis in an effort to limit the differences in both particle size and organic matter content.
Similarly comparisons between different countries can be limited by differences in drinking patterns and different alcohol content of drinks and units [ 6].
Until recently, information on the prevalence and incidence of Chronic Kidney Disease (CKD) in India was limited to small studies, comparisons between which were limited by differences in study populations, methods of measuring or estimating renal function and definitions of CKD [ 12- 14].
However, between-study comparisons are limited by differences in study design, exposure assessment, and different outcome definitions (IUGR or birth weight treated as continuous or dichotomous variable).
The comparability between all these studies is limited by differences in the study settings and health care systems resulting in different ICU admission policies and practices.
