transverse diametral pitch
... preferred diametral pitch 优选径节 Transverse diametral pitch 端面径节 ; 横径节 Mean diametral pitch 中点径节 ...
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各年龄组椎管矢径无明显差异； L4-S1节段15岁以上各组椎管横径大于以下两组（P<0.05）；
SD of all groups was not obvious different in L4-S1 segments, TD of every groups above 15 years old was larger than that of two groups below(P<0.05);
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