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The trips by paddle wheel steamship to Panama and Nicaragua from New York, Philadelphia, Boston, via New Orleans and Havana were about 2,600 miles (4,200 km) long and took about two weeks

Sleep macroarchitecture Only SSDD had significantly lower sleep efficiency (SE), shorter TST, and longer wake time after sleep onset (WASO) compared to controls (all p 0.05)

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While mathematically correct, in practice, we never see values outside of the 014 range