These tumors most often arise in middle-aged females.
最常见于中年女性。
The occurrence of cervicitis in young females was higher than that in the middle aged and aged ( P< 0.05).
年轻女职工宫颈炎的患病率明显高于中年和老年女职工（P<0．05）。
A study conducted on more than 68,000 middle-aged US women suggests that females who don't get enough sleep may end up adding some extra pounds over years.
一项由68000多名美国中年女性参加的研究表明，长期睡眠不足的女性容易发胖。
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