Muscularis Externa Width The absolute width of the muscularis externa (term: 85 ± 16 μm, preterm: 70 ± 13 μm; p = 0.06) and the inner circular smooth muscle layer (term: 57 ± 11 μm, preterm: 46 ± 10 μm; p = 0.059) tended to be smaller in the preterm group, but this did not quite reach statistical significance.
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