因此，压缩、重新打包、和收缩可能会像碎片整理程序一样，能够减少分区总的区段数量。

So compress, repack, and shrink might be able to reduce the total number of extents for a partition, just like the defragmenter.

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碎片整理程序将分区中的多个小区段合并成较长的连续区段，从而减少分区中总的区段数量。

The defragmenter merges multiple smaller extents to get longer contiguous extents for a partition, thereby reducing the total number of extents in a partition.

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结果：两个年龄组的牙龈出血检出率、牙石检出率以及牙石平均区段数，15岁年龄组明显高于12岁年龄组。

Results 15-year-old group is significantly higher than 12-year-old group in gingival bleeding detection frequency; dental calculus detection frequency and average section count.

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