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Moreover, it may be difficult to separate the effects
of salt from other nutrients that may contribute to
stomach cancer risk. The absence of adjustment for
confounding factors (such as age, sex, smoking and
dietary habit) can hamper the statistical estimation
causing over- or underestimation of the real association
between salt or salted food and stomach cancer. In
Tables 1 and 2, few studies have controlled for dietary
factors in their analyses of salt consumption, which
makes it difficult to compare the different studies
according to the dietary variables adjusted in the analysis.
However, the study results that were adjusted by a wide
range of potentially confounding variables, such as age,
sex, H pylori infection, atrophic gastritis, medical history
of peptic ulcer, family history of cancer, body mass
index, diabetes, total cholesterol, physical activity, alcohol
intake, smoking habit and other dietary factors[68],
showed no difference from the crude results. Studies
with adjustment for some or most of the above potential
confounding factors[66,68,72,73] showed no systematically
apparent differences from the studies with adjustment
for a few or several confounders.

The 68th cited research encompasses variables such as age [...] and other dietary factors, but it encompasses most of the encompassed factors?

Does "such as" mean "things like--that may or not be included in the case in question"? Because otherwise the sentence doesn't make any sense at all.
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The 68th cited research encompasses variables such as age [...] and other dietary factors, but it encompasses some or most of the encompassed factors?-- Yes

Does "such as" mean "things like--that may or not be included in the case in question"? -- Yes
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