Why even a short (5-10 years) civil war in ancient and medieval China led to a decrease in population by 2-3 times

Why even a short (5-10 years) civil war in ancient and medieval China led to a decrease in population by 2-3 times, while this did not happen in the Mediterranean?

Famine and epidemics are the main factors that reduce the population in a homogeneous agricultural society. They inevitably break out in any civil war – so often in China. In the Mediterranean, there were many different modes of economy in different climates – there drought or strife could not affect the entire region.

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