不同年龄段的中央腺体积和重量存在显著性差异。
The volume and weight of central gland was significantly different in various age groups.
但安全感在年级、性别、学校类型上不存在显著性差异。
But there are no significant differences of security in the grade, gender, and school type.
父母健康状况不同的大学生心理健康水平存在显著性差异。
The mental health level of college students with different parents health level exists significant differences.
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