  It is more flexible for decision makers to evaluate by interval-valued q-rung
orthopair fuzzy set (IVq-ROFS),which offers fuzzy decision-making more
applicational space. Meanwhile, Choquet integralses non-additive set function
(fuzzy measure) to describe the interaction between attributes directly.In
particular, there are a large number of practical issues that have relevance
between attributes.Therefore,this paper proposes the correlation operator and
group decision-making method based on the interval-valued q-rung orthopair
fuzzy set Choquet integral.First,interval-valued q-rung orthopair fuzzy Choquet
integral average operator (IVq-ROFCA) and interval-valued q-rung orthopair
fuzzy Choquet integral geometric operator (IVq-ROFCG) are inves-tigated,and
their basic properties are proved.Furthermore, several operators based on
IVq-ROFCA and IVq-ROFCG are developed. Then, a group decision-making method
based on IVq-ROFCA is developed,which can solve the decision making problems
with interaction between attributes.Finally,through the implementation of the
warning management system for hypertension,it is shown that the operator and
group decision-making method proposed in this paper can handle complex
decision-making cases in reality, and the decision result is consistent with
the doctor's diagnosis result.Moreover,the comparison with the results of other
operators shows that the proposed operators and group decision-making method
are correct and effective,and the decision result will not be affected by the
change of q value.
